Yet again the posts come out saying "Did you not do your research?" I did research and no where at the time did it state that it doesn't do MMS, that it requires a reboot once a day because the SIM card is forgotten and I am missing important business calls because I don't check hourly to see the little missing sim card icon. Or that when you reboot you now have to input all time and date information because the phone is a piece of badly built junk. Expansys sold it as a phone, not a freaking internet tablet. Look here, see where it is listed. (Under mobile phones)
http://www.expansys.com/d.aspx?i=186949

Yet this forum loves to diss people for buying into a large marketing regime and a few posts of technical specs from Nokia. I never once thought it would go backwards in the evolution of the phone by not supporting MMS, but Nokia did a 'concorde' moment. They took a step back in technical evolution, by not doing what all the other phones since 96 can do. (Concorde was the first time humanity has lost the capability of a technology, in this case supersonic passenger flight.)

But it is all about blaming the OP for choosing a phone that is the biggest pile of unsupported crap on the market. Everyone on here bar a few realistic people claim it is great, that you can hack it how you want, that it comes bundled with great apps. Is it really completely hackable? You have to install an app to get root, download 2.5 GB's of data to get a word processor that works called open office and you can't get flash 10, I would like to see more than four screens that work or solve half the issues with the phone. You can hack some things but others are beyond the scope of the OS to do. MMS that is truly native and doesn't require the MMS server login details of the carrier and doens't need internet to download. A decent file manager that works like nautilus, so I could use drop box for example or see my photos without having to use photo manager. Perhaps a photo management tool that doen'st list every single photo and take fifteen minutes from opening to show me 5000 pictures from my work files before you get to change it to your camera pictures.

Hack those issues, especially not having to have easy debian, a decent photo manager, give me 9 screens, each as customisable as the first four and you can prove to me that the N900 is a truly open OS. The N900 is a walled garden with just less distinct walls and as a result less stable and less things work as they should. Apps come along because of a fundamental lack of thought by Nokia and a need to get those basics working, and at best provide half the function of the original because you have to wait six months or worse, need to run code and apps to get it. Some things are hard coded into the Maemo kernel by Nokia, and as a result nothing you do without their support will change the N900 to be world class.

Back to the OP. Any of the HTC Desire's give you more power and better apps under Android, if you like a QWERTY keyboard use the HTC desire Z, there is also the HD version now and from the apps I have seen in Android you can play anything just as well as the N900. (and when you stop it half way to make a call, the phone doesn't claim that the file format is no longer supported) It is just on board memory that is more of an issue. But don't use easy debian and you won't fill your phone with junk and you should be fine. And it can take a 32GB SD card which is handy if you do want to fill it with junk.