i-Mate have started shipping an OS update to their K-JAM device that includes the extra bits needed to support push e-mail. Push email is just one of the improvements in the MSFP (Messaging and Security Feature Pack) that works hand in hand with Exchange 2003 SP2.

Modaco once again got their first with the announcement: http://www.modaco.com/index.php?showtopic=237393

If you have an i-Mate K-Jam then you can get the bits here: ftp://ftp.clubimate.com/K-JAM_WWE_216901_2169101_020710_ship.zip