Although this probably won't help, I recently looked at the open source License category page at www.opensource.org . Take a look at the category of βLicense Popular and Widely Used or with Strong Communities . β I think this will be a good starting point.
Although you probably need to be a lawyer to really understand and understand the full implications of each license, you can understand the main differences by looking at them. Not all license texts comply with the GNU GPL, so don't be afraid to look at them. (A good example is the MIT license, you can read it in about 1 minute).
(The GNU GPL, btw., Is seen by some as the most restrictive open source license when it comes to using software in a commercial product. I think this was the first reason they came up with the GNU LGPL.)
A few more pointers to other stack overflow questions here:
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