As usual, if you are wanting to upgrade to Pete's Bugless Beast ROM and overclock to the frequencies found in this thread, please visit the three links in my signature. Even if you aren't going to that ROM those links will help you out.
I used Temp Monitor (1.99 on the Market, supports a developer from AllDroid.org) to gather all temps.
According to this document our max operating temperature for the Droid is 85C or 185F. Initially I was concerned about the operating temps while on 950mHz but really they aren't too far off what I was seeing on 800 or even 550, so I am going to let it stay on 950 and make sure I get these temps pretty consistently. I will update if I notice a difference over the next couple of days. Keep in mind these are the MAX temps, so there were times even where at 950mHz the temp was lower at one point than the max of 800mHz. So these are the highest I saw. PLEASE let me know how close of temps you are getting to these. The biggest differences were seen when browsing the web and playing games. The other temperature jumps were so minimal they were almost the same at times.
If you have any further questions about my methods or test please let me know.
Hopefully this is helpful because it took all afternoon.