Another major problem with guitar tablature: only guitarists can read it. While "standard notation" is readable by those who play any instrument, tab is native to guitarists, so those who don't play guitar won't be able to comprehend it. This makes any sort of musical communication with a piano player, or other musician, very difficult.
We've covered the basics of the pros and cons of guitar tablature. Now, we'll take a moment to talk about a few of the intricacies of tab - like how to read/write string bends, slides, and more.
This should give you all you need to get started reading and writing guitar tablature. Again, if you're serious about music, it highly advisable that you learn standard notation as well as tablature. The excellent Modern Method for Guitar will get you sight reading almost immediately.
Okay, enough talk... time to get started learning beginner song tabs. Have fun!