I was fortunate to be in BETA programs for both D2 and D1 and still play D2 sparingly. All of my chars are at lvl 99 and I try to play at least once every three months on all accounts so the Blizz doesn't erase anything. (worked hard to get all that stuff !! ) Tho Blizzard has been busy with Warcraft 3, and if you're interested in that BETA program, go here: http://www.battle.net/register/war3xbeta/
they still listen to talk about Diablo 3... see this: http://www.diabloii.net/ and I suppose it's only a matter of time before we see the birth of a third installment... There's just too many ppl out there like ourselves that create the necessary demand for production. I would assume Blizz will go all out for D3 and that's pretty nice...
Happy Gaming !!! :D