Nothing is certain yet, but all signs point to Posada retiring after 17 years in baseball, all with the Yankees. Sweeny Murti of WFAN first broke the story on Saturday, before all the Giants and Tebowmania of Sunday.
Posada was one of the many instrumental players during the Yankees' three-in-a-row Championships of the the late 90s and became the full time starter in 2000. In the subsequent 7 healthy years he averaged around 25 HRs per season along with around 80 RBIs and .275 AVG. All great numbers for a catcher.
But his body has worn down over the last few years and this season he was forbidden from catching and relegated to the full time DH slot.
Posada was never a great defensive catcher and many a pitcher had been known to request other catchers to call their games. But through it all, he played well and earned so much needed DH days that all catchers need to stay healthy during the long season.
But his defensive weakness will probably keep him from the Hall of Fame. We hope to see him their someday but I doubt that he'll make it.
On a side note, Posada's son suffers from Craniosynostosis and if you wish to donate to his charity for a cure you can visit the website here. Jorge Posada Foundation
In any case, he'll certainly be an all time Yankee great and his number will be retired soon.
Oh, and he also has a beautiful wife.