My complaints about Froyo are about the substantive features of several applications.
Contacts:
-- Improved sort (last, first) finally
-- Can't set or view by category/group
-- can't set prefs by category/group (eg, group ringtone)
Calendar:
-- Still just plain sucks
-- Can't edit calendar category after creating event
-- Does not remember last view
-- very limited alarm functions
-- most of this will be cured when Pimlical is out (hope it's soon)
Email:
-- no option to sort by oldest first or newest first
-- finally fixed signatures (yay!)
-- can't undelete
-- deletions do not delete from server with IMAP accounts
-- no option to retain messages in inbox for certain number of days (for some reason it only keeps about a day's worth of messages, which can be inconvenient)
-- no option to change the account from which you are sending once you create a new message
-- basically, the email app lacks many features that were widely available on third-party apps for the Treo (Chatter email & Snappermail)
Those are my principal complaints. I have already decided that a third-party option will be needed for calendar. Contacts will have to be fixed by Google. Maybe there is a better third party email app.
Otherwise, I like Froyo.
~aviduser