So I basically really like Dungeons and Dragons. While I'm relatively new to the game, and I typically only play 3.5, I love everything it stands for. Unfortunately, I almost never have a group to play with. Something always gets in the way, which makes me eternally sad in the face. That being said, there are a few ways I deal with this problem...
ROUTE 1: CONCENTRATED AWESOME
I love the Order of the Stick so effing much. It's the first way for me to get my DnD fix despite my lack of DM and other PCs. For those of you who don't know, OotS is a web comic depicting a universe more or less based off of the DnD 3.5 rules which has evolved from slap-stick, one-shot humor to a very developed and engrossing story line filled with characters you'll both love and hate. This sounds a bit like an advertisement... but I stand by what I say.
ROUTE 2: DND-BASED GAMING; HAVE I DIED AND GONE TO OLYMPIA?
I actually discovered Neverwinter Nights pretty recently, which leaves me aghast. The game is freaking awesome! It's literally 3.5, except add Faerun and take away all the paperwork, which makes it almost better. The only downside being that, although the feats, spells and classes go far beyond Core, it still doesn't have the freedom and supplements necessary to run around as a focused conjuration Master Specialist with Abrupt Jaunt and can cast in anti-magic fields. Actually, that last part surprised me - the feat that lets you cast in AMF is from Faerun, but ah well. Still, awesomeness all around.
ROUTE 3: INTERNET DND CAMPAIGNS
I only mention this because it's likely a very real solution to a lack of DnD, yet I have never done so myself. A good place to find groups is actually at the OotS forums. I've always been to lazy to look around and find one.