Plain old aloe works pretty well. I used to have a huge aloe plant that you could break a spine/leaf off and squeeze the goo out of and it was amazing. The aloe with lidocaine is even better. As someone mentioned, these are only for minor burns/sunburns.
I haven't tried the burn gel, but I'm going to get some. I've heard them recommended by many people. A lot more convenient to carry than an aloe plant, too.
Kevin B.