>>
2.1 Update Here<<
This was obtained from Dell's staging site and is apparently incomplete. That is, it is missing some features however in terms of stability I have had a few hung processes but its generally the same experience as I had on 1.6 with regards to stability.
IMPORTANT: THIS UPDATE WILL WIPE YOUR DEVICE BACK TO FACTORY DEFAULTS. Contacts should be synced with your GMail account however I'd recommend you backup all settings with a tool such as MyBackup, a FREE download from the Market. I used it and everything went smoothly, apart from some apps & widgets which didn't restore correctly due to differences in the Market I believe. Still, redownloading them doesn't take too long
To update, download the package, rename it to Update(.pkg), place on the root of the SD card and power off your Streak. Then power on while holding the volume up+down buttons.
This update is only designed for O2 branded devices HOWEVER it can be installed on unlocked Streaks and US Streaks if you root your device FIRST and do some things beforehand. Also as far as I'm aware if you have already rooted you need to take different steps to the ones I have provided.
It would appear that this update does in fact NOT give root access as I had initially thought. An application said it did however another one requiring root access doesn't work. The rooting tool released a while ago should work with this from what I've read, although I haven't tried it as rooting doesn't really interest me.
Final thoughts: Although this is an unfinished build it is worth upgrading as 2.1 makes the device feel a lot snappier and has lots of cool new stuff like live wallpapers, native multitouch support and other apps on the market not available on 1.6. 720p video recording is VERY nice and the audio quality is greatly improved too on video recordings. My only niggle is the generic 2.1 keyboard which I dislike and greatly prefer the original 1.6 one however its a small sacrifice to make for all the other great improvements.
If you are itching to use 2.1 then go ahead and grab this I'd say, although if you can wait until September, the offical O2 update will be released, which will hopefully have the original keyboard back. =]