The Ol' Lady and I just got two Allys from Verizon. We noticed that when you are in a call and press "keypad" to enter alphabetic info for a name or something-there are no letters under the numbers! There ARE on the main keypad when you first start making a call. A guy at work has an older Droid and his shows the letters. In other words, if you have to enter someone's name, you'd have to have a picture of the full dialpad to read to do it!
Also, we found out you can never really delete email messages (hotmail/yahoo) since they come back! Tech support said "yup, that's correct-they aren't removed from the server so they bounce back."
I have a bluetooth box that would voice dial with my old Samsung phone (sch-u700) by pushing the "receiver" button. It would then say "please say a command" and I could say "call home" and it would dial. Apparently there's no way to do this on an Ally, so you have to LOOK at the phone while driving to dial.
There are a few other things I can't remember now, but I'm wondering are these inherent to the phone or the OS, and will future upgrades fix these issues?