I'm sure many people have ideas with Boost Energy, but some are like uber-l33t and don't want to post their "secret" deck. ._.'
Slaking is going to be more powerful when the next comes out. New stadium helps alot. Boost isn't bad for slaking either, but it says you have to discard basic energy, so slaking leaves himself with no energy attached after he attacks.
Any EX with a high colorless attack (GCCC, WCCC, WWCCC, GGCCC, etc.) will take advantage of boost. Kingdra EX works well with boost. Salamence EX, etc.
I like Exploud, too bad it isn't played. Probably would work well with Jumpluff lol and Pidgeot.
Boost helps all decks, other than Haymaker which isn't played lol.