If you don't mind the snarky comments, James Lileks has posted a series of
computer ads from the 60s and 70s:
http://www.lileks.com/institute/compupromo/
I also found a link to a BBC commercial for a Prime Computer from the late
70s/early 80s (it needs RealPlayer) that features a rather famous scarf
wearing time traveller:
http://plorkwort.livejournal.com/120042.html
-spc (I found them interesting ... )