I'm old school - or maybe just old. I didn't have an e-mail address until I was in college (even then I don't think I used it much), I didn't get a cell phone until I was a year into grad school, I remember playing "pong" - I'm even so old that I remember thinking pong was cool. My first video game system was an Atari 2400 - it was brand new. We didn't have a computer at home until I was in middle school. When I think how completely dependent I am on technology that has been developed since I was 18 - it's a little horrifying.
I click on Letsrun if I want to see what's going on in the running world or just see where "flagpole willy" thinks I should invest my money, I use marathonguide.com for the easy to use pace calculator, I pop onto washington running report for the local running calender and results, I head over to USATF running routes if I'm in a new city and want to see where the locals run or want to measure a route, and of course I go to twss to find out the local workout - or see what the latest post is from a growing list of bloggers like myself. Of course I keep all of this surfing to non-work hours only.
One website that's kind of cool and was started by the local running store in my hometown is half2run - it challenges people to run half marathons in half the states. they have a pretty good list of half marathons from all over the country - and a place to keep track of where you've run.
I probably look at Letsrun more than anything - the front page has a pretty good list of world-wide results with commentary from the sites founders wejo & rojo (the johnson brothers). Lost like diamonds in a haystack are some pretty good posts from the message board (Brian Sell once famously said of the Letsrun message board, "if I wanted to know the opinion of a 18:30 5k runner I'd ask my wife") . They've saved the best in the 4th sticky down on the message board - anything by renato canova (Italian coach of many Kenyans), Hadd, or John Kellogg are my favorites. Jack Daniels will sometimes post as "jtupper" - and all runners should know about the "summer of malmo". And there are plenty of characters such as the aforementioned flagpole willy, the 4:30 miler, meyerhoff, etc.
Instead of post-modern - they should call our age "post-boredom".