Grass Valley have released the new version of EDIUS.  5.5 adds two important things:

1) Support for Windows 7
2) The AVCHD booster pack which lets you edit AVCHD as if it was DV (if you computer is fast enough).

The update is free to all EDIUS 5 users.  For more information visit the Grass Valley Website:

http://ediusforum.grassvalley.com/forum/showthread.php?t=15923