The Maccast I like Adam's site Forum and especially his Podcasts the Maccast and Maccast Loop, he and Victor do a great job, and talking about Victor his Podcasts are also great listening
I use this forum and there are some good Stickies for the new users,
BUMP a British Mac users site some young guys with some great opinions !
This is a good source for free instruction on Mac MacInstruct
If you want to pay for lots of screencasts go to Screencasts online
OK not so much great website but subscribe to Steve's podcasts and slowly go through his back catalog of casts and you'll learn loads!
Some British Orientated Mac Websites
ukmac
britishmac Great Podcast
MacBites go there and download their podcasts I like em.. especially Mike ah ha which one!
FMEO been listening to For Mac Eyes Only for a while now certainly one to listen to, and no I'm not just biased because I'm been on it.
I have seemingly got a regular spot on Michael's podcast so I now encourage you to take a listen, go on it's pretty good.
Surfbits Mac Review Cast is also a Mac podcast worth a listen.
I'll add some of the other Sites I use asap