Reply to HOW TO... create a mash up?

Hey guys, I've been creating mixes since December 2010 now (couple months) and I feel like it might be time that I expand my creative horizons. I know my stuff, imo, so you guys don't hafta talk like i'm a noob

I feel like I might be ready to make a mash up... just need a couple pointers in the right direction.

I guess what I'm asking is does anybody know a good website with a tut. for mash ups or is anybody able to give me some tips and pointers from their own experiences.

If I take the acapella of a song and then play that against a track with no lyrics would that be considered a mash up? Of course I wouldn't just be playing the two together and let it run the whole way through.

I'm believeing cue point juggling and sampler are important for a mash up?

Any help is appreciated!