Ok, this is not so new, but for those of you who might be interested, there is now a fully working version of vBagX, the first GBA emulator for mobile phones.
If you have a Nokia S60 phone (there are many of those out there) you should really try it. It works full speed on most phones (with sound off though) and it's pretty much the same as playing on a GBA micro.
If you don't want to carry out a GBA/DS/PSP, this is so far the best way bring some entertainment everywhere. I highly recommend it.
The emulator can be found at the official website of www.vampent.com
If you have any doubts you can always ask on the forums (BTW, I'm a mod over there ).
Hope you liked the news!