The Speech Accent Archive is really cool. Check out the diverse array of English accents, for instance. Alas, most of the British contributors sound pretty similar -- I was hoping for a sample of Cockney or Scouse. But there's a yummy Glaswegian accent, and I'm rather fond of the speaker from Wellington, New Zealand as well. No Welsh speakers, though, more's the pity...
And for a somewhat less educational listening experience, there's always this (hint: you'll need to click on one of the hands).
And for a somewhat less educational listening experience, there's always this (hint: you'll need to click on one of the hands).