Here's my findings, tested on an iPhone. My n810's dead, so I'll test with it when I get to charge it.
-You mentioned that it's designed for Pandora/iPhone res, so I'll say this: there's a black stripe on the right side when using safari; in other words it's not wide enough.
-If you click on the "user video/review button," it just goes to the video page, is this intended when there are no user videos or reviews?
-Also, shouldn't the videos not be youtube, since the Pandora can't do flash (yet)?
-I don't think the text you type in the search box should be in italics, it looks weird (nitpick), and I think maybe "my account" should go above the search box, or maybe the search box should go at the top. (hard to imagine it though, it might look the best where it is.)
-If search finds nothing, I think it should tell the user something to that effect, right now it is just blank where the results should be.
-The filters on the top rated, etc. don't seem to work.
-Just an idea, perhaps filters could be changed to: big text saying "Filters:" at the top, then some big check boxes next to the filter names, and you can check more than one to narrow it down further (example use case: check the "top rated" and "new uploads" filters to see what the top rated new uploads are.)
-When you sign up, it doesn't check the email for legit-ness (@ symbol, .org/.com/etc.), and I think it should also send a confirmation email.
-Also, if you do something wrong when signing up (like not enough chars in username or something), the error message page is randomly on a white background, with very tiny text for a small screen, I think this should be changed.
-I couldn't download any files in safari (it's a jailbroken iPhone and CAN download), but it's probable this is just the browser's fault.
-When you click to download something and get the message saying that the download will commence in 3 seconds and so on, the text is too close to the sidebar; I think it needs to be moved over to the right a little bit.
-In the comments, when you click to vote a comment down, it goes to an "object not found" page.
Well, there you go, hope it helps some.
Sorry if I repeated something someone else said, I didn't have time to read the whole thread first.
EDIT: Fixed some typos.