1. AOL - I was about 10, didn't have a lot of choice
2. NetZero/A couple of other lesser known Free ISPs - despite being free, they were still better than AOL (which my parents refused to give up). had to deal with ad bars though.
3. SegaNet - got it for the dreamcast, but used it on my PC instead of AOL (which my parents STILL refused to give up, even though I was paying for another ISP). It kicked ass, I got near DSL-like pings with it.
4. Earthlink - after Dreamcast bombed, they sold their ISP subscriptions to Earthlink
5. Drexel ResNet
6. Hotwire DSL - local carrier in my building, sucked, soon replaced
7. Verizon DSL - got rid of Hotwire, no other options in building
8. Road Runner cable - new apartment
9. Comcast cable - bought Time Warner/Road Runner in my area
10. Verizon DSL - new apartment/town, wanted to ditch comcast completely
11. Comcast cable - couldn't get DirecTV for TV and the verizon dsl service was spotty/slow