I don't think 5 improvements will make it the best phone upto date, it might make it worth the asking price however.

My five for what it is worth.
Flash 10 would be nice. The amount of web pages going for it is getting silly and every day limits the kind of web pages I can view.

Ring tones for different contacts, (No the app doesn't cut it, I want to have it ring immediatly the call comes in, not take 15 seconds to decide what to do as by then the person hung up) YES I know it isn't a phone (Despite online reatilers selling it as such.)

MMS, I don't use it all the time but when I do I need it to work and fMMS while a good gap filler, isn't the same thing.

More control over pictures and file explorer. I want it to default to camera folder (or one of your choice) not catalogue all 5000 or whatever images then show you them all and have you filter them afterwards. I installed some games and EVERY image from them has to be looked at, so wargus, dune, duke nukem have given me a few hundred. WHY would I want to view them?

Ovi maps. I would say ovi suite but 'nokia pc suite' does a basic job of syncronising. However Ovi maps is just dire, no voice directions and the UI is appalling compared to any other sat nav, I still can't get my head round how to do basic navigation without drinking battery while I think and argue with the screen interface. Only few times I have needed to use it, I have just been horrified at how bad it is. 25 mins, half my battery to find out it can't display the roads in the middle of London because it thinks I am in the middle of a beige place with no roads. So at least if Nokia could sort that rubbish out.

That limits it to 5, but I think we all know after the little amount of stuff in the other PR 1.2 and 1.3 shows Nokia's support of the n900 and Maemo is lack luster to say the least. Nothing new will be coming unless from the community and they won't fix bugs they introduce so what hope is there for the future.