Won't harm it wiping the SD card.
If i popped it out and popped a brand new one in; it'd have nothing on it. Therefore, you'll be safe
Thanks. Upon you advice I wiped the SD card too, you're right, it reinstalls any system files automatically and loses no core data. It's very nice to have a clean slate and not have all of the crap I had on there. I had all of this music on the card. But, I used Pandora and never actually played any of my songs - wasted space.
I did the factory wipe. It got the 2.1 OTA and for some reason (perhaps since I have appbrain) all of my apps were waiting for re-download in Market.
I thought that all free apps were lost when you wiped - this was surprising and awesome.
Wipe did wonders - I had laggy and buggy problems and could not track it down to a specific app, hack, or rom. Now, I can start off clean and slowly build it again. Right now (stock 2.1) this is the fastest and smoothest I have been in weeks.
I installed 29 apps and I'm at 80% (209Mb) free phone memory and 98% free on SD card - this sucker is humming. It's like brand new. I never fell out of love with my Droid. But, we were arguing and needed some counseling. Now, we're on our second honeymoon.
2.1 review...
pros:
-- yahoo mail support
-- a cleaner pinch to zoom in browser than any rom I was running
-- more stable live wallpapers (roms would sometimes just stop working the live papers)
-- very fast and responsive
-- faster response on wake up (I use "mylock" to bypass the lock screen and it's on home in under a second. Compare that to rooted, and hacked 2.1 - it took about 2 seconds. I know that's a small difference in ACTUAL time. But, it demonstrates snappiness)
cons:
-- only 3 screens (fixable with home replacements, I'm just not a fan of them)
-- no overclocking (but, I think this was a placebo effect anyhow)
I don't know about battery performance as I've only been running it for a few hours now. But, i just did about 2 days worth of stuff and i'm at 70%