Not to rain on your parade, but developers.slashdot is not the "full" slashdot effect. The full slashdot effect (from personal experience getting http://inter-sections.net/2007/11/13/how-to-recognise-a-good... slashdotted) happens when you're on the front page of slashdot, and results in about 100-150k visitors from slashdot itself, accompanied by another 20-50k visitors from other sites that pick up the story. If you get front-page-slashdotted, you'll probably also get dugg and redditted at the same time.
For the record, danieltenner.com has had 50k visitors in a day from just reddit + HN...
The problem also usually comes up when comments start to add up (another reason why disqus rocks). http://inter-sections.net/2007/11/13/how-to-recognise-a-good... had a couple of hundred comments within a day, and since Wordpress (it was on WP at the time) didn't cache them, the page load got excruciating.
That's not a problem for http://danieltenner.com anymore, since comments are now served by disqus, and the pages themselves are static html. I suspect I could take several "full" slashdottings at the same time now and still stand. Nginx is pretty good at serving static files.