I've been doing it for a while. I got into it about 30 years ago after I graduated from college, did it for several years, then went into hiatus as the craft beer scene took off and it was just easier to buy good beer at the liquor store. I started back up again 7 years ago when I moved to Utah and got beer shock at the lack of quality beer available (to be fair that has changed as the number of craft breweries has greatly increased in the time I have lived here).
Homebrew Talk is a good online forum. Good information there. Patsy is right, it is definitely a slippery slope. This was my Christmas gift to myself last year:
Keezer with 2 CO2 taps and 2 Nitro taps. I have a Fat Tire clone on tap, a Autumn Red, and an Irish Red on Nitro. In my fermentor I have a Guinness clone just about ready to keg and fill in that last Nitro tap.