Gardening Forums - Ask Gardening Questions at Dave's Garden
Good site, although I'd swear you didn't used to have to be a subscriber for access to most of the sub forums.

You could also google garden blogs for your area, they can be fun and informative to read sometimes.
Second hand bookstores are also a great, inexpensive resource for gardening "how-to" books. I've found some real bargains on books that pertained to my locale, mid-south gardening. I'm sure in your location you'd find books that were appropriate to your gardening area.
I've also learned a lot from going to local plant sales and talking to the people there. I was also lucky enough to have a botanic garden nearby that sponsored a lot of classes, lectures, etc. Great resource!
I tend to think reading and planning are half the fun of gardening!