Best place to buy LEDs is by far ebay - you'll pay under 1$ each there (most retailers will charge at least twice that). Personally I like the ones lckwtc is selling, but to each their own.
iagrams - there's a thousand websites explaining wiring LED arrays, just do a google search.
Pics - Might have a few coming later today if I decide to go nuts and light up the 65g totally with LEDs. Not going to post the duct tape and bindertwined version I'm running now
Andy