FinderPop 2.2 is not compatible with Snow Leopard 10.6
I will be getting my copy of Snow Leopard next week and will look at updating FinderPop to be compatible as soon as I can. This is made slightly more difficult because my main Mac is still a PowerPC Mac Mini :-/
Unfortunately updating FinderPop to be compatible with 10.6 will likely require a fair bit of work so it may be some time (a month?) before I can release a compatible version.
Apologies for the delay -- but I have a good excuse! (q.v.