I taught myself guitar from the AniTabs website before I discovered WholeNote. Ani DiFranco, the little folksinger from hell, uses alternate tunings for most of her songs and the tab website at http://www.netspace.org/~leigh/ani/
contains transcription of most of her songs. If you're not into her music, you could just use the index of songs by tuning for ideas on how to tune your guitar, or if you want to play her stuff, the tabs and tunings are all there. I'd recommend you check her music out for some good songs in crazy tunings (she makes up her own and rarely uses tunings as conventional as open D and the like.) That's how I got into alternate tunings, anyway. Now I retune my guitar for almost every song I play. It would drive some people nuts, but you get good at retuning by ear pretty fast. Use an electronic tuner to teach yourself, but ditch it when you don't need it anymore. The ear beats all for retuning fast. You can actually create good tunings by just altering one string from standard: EADGAE, EACGBE (makes Crash Into Me by Dave Matthews easy), DADGBE (drop-D), EADGBD, EADGCE, EADF#BE, EGDGBE (fret your low E at the third for a G drone in the bass if you're playing in G)...the possibilities are endless. Make up your own tunings. If you write songs, it can be part of the creative process. Like I said, an electronic tuner certainly has its uses. Hope I've helped a bit.