A topic about spiders stalking prey on the WildAboutBritain forum prompted a quick bit of research, and tied in with a pub conversation at the recent BAS AGM. This is probably old news to many of the Arachnologists that frequent the forum, but pretty interesting stuff for less well read members like myself.
Portia fimbriata from Australia, a salticid that often hunts other salticids has some interesting hunting strategies.
Cryptic stalking and prey selection paper:-
http://jeb.biologists.org/content/203/22/3485.full.pdf 
Short clip of the cryptic stalking:-
http://www.youtube.com/watch?v=aRIpYVwY820 
Route Selection:-
http://www.rifters.com/real/articles/Tarsitano%20and%20Jackson%20-%20Spider%20selects%20detour%20routes.pdf
Closer to home, the common salticus scenicus would make a good subject for research along the same lines perhaps.
Regards, Matt