I started playing back in late 1999 too, I remember discovering CS in PC Gamers review of the beta mod. I was into TFC at the time, so another multiplayer game to play was a must have.
I used to play on the old PC Gamer servers, barrysworld, and PC Zone. I played in quite a few clans but non worthy of any mention
I think the aliases I used to use in those days were -=[A]=-, phatrix, Cr@zY, and some other silly names - I was always changing my name is nobody will probably 'know' me.
I've been playing right upto source, but I don't really tend to play CS anymore. Once the transition was made from 1.5 to 1.6 I just wasn't really interested in the game anymore. I never liked what they did with 1.6 and with source even more. As well as this, I'm just tired of the damn kids that populate the servers and 'try' to bully you because they have admin and who are abusive. Anyone who's played in the early days knows things were a lot calmer and friendlier, now it's all about "You suck" and "You should quit playing cs" because "I'm better than you" and "go die k thx".
TF2 is where I am at now and occasionally L4D, and I find players are much friendlier in those games, which is more enjoyable.