I'm not sure what all the complaints are going on here..
I paid for Saft for 10.4, an upgrade fee for 10.5, and again for 10.6 - - never in between.. and frankly they were all great updates to a product I wouldn't want to use Safari without.
If someone doesn't want to use this software, that's fine, but I don't see any reason to trash the developer personally.
I'm happily using Saft on my Snow Leopard computer with the latest safari, and probably won't upgrade to 10.7 until a compatible version of Saft is released (a paid update or not)