Good god, let's not sully the videos with shout-outs... and forum-side rewards aren't necessarily going to work. Not all donators will use the forums.
I'd say either go the Andrew Hussie (MSPA) route and make a bunch of t-shirts and random merch - probably not a feasible suggestion - or go the Toady One (Dwarf Fortress) route and email out rewards/put them on some reward page on the site.
I suppose if people are really desperate for forum rewards, you could plonk a tiny heart next to their name, but try to keep it classy...