Just thought I'd point out the unusually high number of guests we've had online today... it's been averaging over 1,500 throughout the day with peaks of over 2,100 at times. The page hits have been over 5 times the average today.
The cool thing is, I haven't noticed a single bit of degredation or slowness with the site... now that's pretty cool!
btw - I thought there was a problem with the sessions table at first (therefore incrementing the users logged on but never clearing them), so I cleared it this morning, which will explain why you were prompted to log in all o a sudden (outside of the normal routine). It turns out that there was nothing wrong, it's just been a busy day.