2. MLB.com At Bat app: The best-selling sports app in history is in postseason mode and costs just $3.99 for premium At Bat 13 features. Click the series round at the top, from Wild Card to World Series, and get the latest scores, news, stats, highlights, live audio and more. Use it on your iPhone, iPad or supported Android or BlackBerry device. Follow Gameday live play-by-play and enjoy Postseason.TV anywhere.
3. Order tickets: Keep an eye on the schedule and act fast, as tickets are subject to availability.
4. Club postseason sweepstakes: MLB.com will be holding contests throughout the postseason, giving away a pair of tickets to each participating team's first home game during the Division Series and League Championship Series, plus a pair of tickets to each game of the World Series. Sign up on each participating club's official site to enter.
5. Hottest cold-weather gear of 2013: Managers and players will be wearing fresh gear in the dugout as temperatures drop this postseason, and it's available at the MLB.com Shop. It's the Authentic Triple Climate 3-in-1 On-Field Jacket from Majestic Athletic. The inner layer is the Authentic Double Climate On-Field Jacket, which keeps you warm and dry. It can zip into the outer layer, which can also be worn separately as a lined, water-resistant windbreaker. Put them together and you have the best baseball jacket. Ever.
6. MLB.com PrePlay sponsored by T-Mobile: Predict every at-bat of every postseason game with this free app for iOS and Android. It allows users to make pregame and live predictions while chatting with friends, accumulating points and climbing the global leaderboard.
7. News: It's that time of year when a single moment warrants a full-scale array of stories, columns, videos and photos. Get the most comprehensive game coverage you will find anywhere. MLB.com also will stream all pregame, postgame and workout day news conferences live through the World Series ... plus someone's parade.
8. This fall, Think Spring Trivia Challenge presented by Scotts: Compete in daily trivia games to win a trip to Sydney, Australia, for the 2014 MLB Opening Series. Receive up to 11 entries per day, depending on how quickly you answer that day's questions correctly. On Oct. 14, MLB.com will pool all the entries and pick a winner. The more you play, the more entries you will have in the drawing.
9. #PostseasonPride Vine ticketing contests: Each postseason club's official Twitter will post calls to action for chances to win tickets to various games. For the Division Series, capture at least three friends displaying their Postseason Pride for that club. For the LCS, capture at least three places in your area that are displaying Postseason Pride for that club. For the World Series, tell us in six seconds or less what going to the Fall Classic would mean to you, and @mention who you would bring to the game. For each contest, the most creative entry will win tickets, and fans will have to submit their entries by mentioning @club and tagging them with #PostseasonPride.
10. #Postseason: Use that hashtag on all your tweets this month if you want an audience. Select Major Leaguers will serve as Twitter #Postseason special correspondents. Follow @MLB to stay in the know.
11. Head-to-Head Challenge: Download and play MLB.com's official daily fantasy baseball game each day of the postseason. Challenge your friends or an MLB.com expert to daily drafts consisting of players from each game this month.
12. Pulse of the Postseason: This daily video wrapup is as comprehensive as it gets. Also look for the "Pulse of the Postseason Pregame Show," featuring analysis and interviews in-studio and at the stadiums. MLB.com talent will include Jack Morris, Jeff Nelson, Mark McLemore, Marlon Anderson and C.J. Nitkowski, and Frank Thomas will join the crew for the World Series.
13. TagOramic: These high-resolution images are available for every game this postseason, so you can tag yourself or others, and for the first time you can "grab" a photo from within TagOramic to share on social media. And if you love postseason pics, find the best action shots at the MLB.com Photo Store.
14. MLB.com At the Ballpark app: Attending a postseason game is something to cherish forever. This app -- recently honored as the Best in Sports Technology by Sports Business Awards -- is a way to make sure you get the most out of that experience. Check in from the ballpark, upload personal photos, use the My Journal section for a personalized history of games attended and download the latest player entrance music and stadium tunes.
15. Postseason Shop: If you don't have your clinch gear yet, no problem. You'll find everything from Boston's #GETBEARD T-shirt to Pittsburgh's authentic On-Field 59FIFTY cap with -- it's true -- a 2013 Postseason patch on the side.
16. T-Mobile Postseason Celebrations: Look for a story and video package for each series-clinching game.
17. MLBlogs: Post entries all month alongside MLB.com bloggers such as MLB Network analyst Mitch Williams, Red Sox reliever Craig Breslow , A's second baseman Eric Sogard and the official Dodgers Photog Blog. Make it your social hub.
18. Explore history: If you want to succeed at No. 8, click here to rediscover past postseasons. Watch baseball's best moments, from Babe Ruth's called shot in 1932 to Boston's 2004 ALCS Game 4 comeback.
19. Bid at the MLB Postseason Auction: Phillies fans might want a third base that was used during Game 1 of the 2008 World Series. Yankees fans might want a baseball that CC Sabathia threw to Jayson Werth in the 2009 World Series opener. This is loaded with artifacts from Fall Classics past, a great way to combine past and present.