http://www.YouTube.com/
Is a great site for finding some classic squash videos take a look at some of the examples below.

John White (Sco) vs Jonathon Power (Eng) 2003 Final some amazing rallies!!!
http://www.youtube.com/watch?v=gfqRkNYqqjI

Tribute to the two greatest squash players ever (Jahangir and Jansher Khan) their records are incredible (maybe even best sporting players ever!). (Including 10 consecutive British Opens, 555 consecutive professional matches won, 14 world titles between the two of them, ...)
http://www.youtube.com/watch?v=f39n2zl3uEY&feature=related
http://www.youtube.com/watch?v=cIr2EDwnVz0&feature=related (modern racquets & very long rally)

World Junior Final 2009 (not bad?)
http://www.youtube.com/watch?v=OO8uHZK9dW0&feature=related

British Open Final 2009 (Nick Matthew vs James Willstrop)
http://www.youtube.com/watch?v=WZVXUbUO20s&feature=related

(England No. 1 world No. 4) Nick Matthew vs Chris Simpson (Gold Medalist from the island games)
http://www.youtube.com/watch?v=-lkl0Z6hXfM&feature=related

World Team Championships 2009 (Egypt vs France in the final)
http://www.youtube.com/watch?v=IeUZAci5rTQ&feature=related (Final Commentary)
http://www.youtube.com/watch?v=cKnmUAGFO50&feature=related (Day 2)
http://www.youtube.com/watch?v=HdAMLbQHw5E&NR=1 (Day 3)
http://www.youtube.com/watch?v=NTLGX_KsKp8&feature=related (Day 6)
http://www.youtube.com/watch?v=iNHXRiOXrWA&feature=related (Quarters)

Mike Way (a series of coaching clips quite useful for beginner and intermediate players)
http://www.youtube.com/watch?v=6uuDRO8SKJ0&feature=related