I've been maintaining this on the FFG site for quite a while, figured I should mention it here.
I created a unified single rulebook for Talisman with all the FFG 4th edition expansions. You can get the PDF file as well as see the details of the minor customization's I included to make all expansions fit together a bit better from the link below. You can easily ignore these if you don't like them and just get the benefit of a single merged master rulebook.
When I make updates I post a notice in the FFG thread, so subscribe to it if you would like to know when something changes. It's not often. If GW (through coilspring or wherever) publishes a new expansion for 4th edition that hasn't been previously released by FFG I will add that to the master rulebook for sure.