IC Diamond I already tested and I think, in as few words as possible, it's snake oil.

STG2 I can't find, but I was curious about it as well. I kind of wish it were in the same format as STG1 (i.e., a brush applicator) as I've never used it, but alas I can't find it stateside.

H-Bridge sounds interesting, especially when you consider this is likely the exact same stuff, just at half the price (the 9.24W/m-k has to be more than a coincidence).

That said, I've already ordered the Gelid GC3/Extreme...I haven't seen a review where it didn't give a boost over everything else, so should be interesting