Yep, App manager is laughably slow compaired to the iPhone's, got a little jealous of the iPhone. (Only for a second though)

I think it is the Maps app fullscreen icon that doesn't play ball, as Xterminal shares the same icon as the browser. Bugged me a little, lack of consistancy.

Multi select in emails works fine, and always has.

In the Inbox click on the title bar and select the action you need.
Select the emails you want.
EDIT 1: Ctrl+A will select all emails. (Thanks to atilla below)
Press on the action button in the title bar (Delete as in the example above)

My only gripe with the email app is that since PR1.2 emails no longer download automatically and if you delete from the phone they also delete from server even though 'Leave on server' is checked.
EDIT 2: A fix is now avalible http://talk.maemo.org/showpost.php?p=722013&postcount=1 (Thanks to Crashdamage)

Browser full screen flicker, I agree it's there, but I also think 'So what!' but if you want smooth flicker free graphics buy a iPhone, it's what they do best.

Don't forget bugs are still been worked on, just look at the bug tracker to see the work been done. PR1.3 will come with hopfully more improvements.