I just recently had a blog post go to 4500 diggs (Yet roughly I got more than 28,000 hits in one day) and haven't seen the server chug one bit. I am using some Wordpress caching and things which help the MYSQL queries but no trouble here. Just as an fyi, I am on Sprite.
As a note:
Here are my stats for the last 7 days --
Successful requests: 710,782 (664,505)
Average successful requests per day: 35,603 (94,929)
Successful requests for pages: 76,558 (68,426)
Average successful requests for pages per day: 3,834 (9,775)
No problems here.
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