TFINDLAY  There is a preference setting on the Invoice page of the Preferences to set either Entourage or Mail as the preferred email program.  
(Version 4.5)

MADMEG  Well so there is! Thanks! Still, the default setting should be for Mail and Entourage users should have to go searching for that tiny little button in the preferences! ;)  
(Version 4.5)

DAN NEAL  You won't miss the RSS feeds in Safari once Leopard gets here since it puts them where they've always belonged, in Mail.app.  
(Version 1.5.2)

SJK  Many people will strongly disagree with you that RSS feeds have "always belonged" in Mail. One reason is that with certain feeds it's convenient to open individual items in new tabs/windows when you're already in Safari. MacUpdate happens to be a good example for that usage style: view its RSS feed in a Safari window and open a bunch of specific product items of interest in background tabs for later browsing.

There are plenty of valid reasons for using different methods to access RSS/Atom feeds, which I already do now with Safari and NetNewsWire and will extend that to include Mail in 10.5.  
(Version 1.5.2)

KINGADROCK  I tend to feel RSS feeds have always belonged in NetNewsWire Lite.  
(Version 1.5.2)