If you are looking for a good site for learning the Hebrew Aleph Bet, I would recommend the Hebrew site of the University of Texas at Austin. Esther Raizen has put together a number of helpful tutorials for learning the Aleph Bet (though these are for Modern Hebrew) all in flash format. The tutorials are especially helpful for those trying to learn through self-study because several of the tutorials include a native speaker pronouncing the names of the consonants. In addition, there is a puzzle game that will help one to learn the order of the consonants.
If you are looking for other Hebrew tools, you might check out the Hebrew resources page on this site.