New unofficial firmware updates are currently available for some of the BlackBerry handsets. You can find download links for each of them below:
BlackBerry Storm 9530 - 188.8.131.52 - browser is very quick, YouTube runs faster, the handset is a bit more responsive, but there are still some bugs.
BlackBerry Bold 9000 and Curve 8900 - 184.108.40.206 - threaded MMS, tabbed browsing was removed (temporarily)
BlackBerry Tour 9630 - 220.127.116.11 - "old and buggy" firmware, according to Crackberry. Edit: The file has been deleted, but no loss here.