I want to mix a few songs together like shorten , copy, cut bits out of them but i don't know which is the best program. So far I've been using windows movie maker but is their something else better. What are your opinions?

Audacity

For basic stuff, NCH's WavePad is great... and free. Theres also a paid version, but for what youre after the freebie is great.

It'll be under nch.com.au somewhere, just make sure you choose the free WavePad, not the demo (as its a time-limited full version).

froot loops or virtual dj if you wanna be creative

http://audacity.sourceforge.net/

goldwave is basic and simple

cooledit and heaps of other shit out there

audacity or fruit loops for sure.
audacity is open source and free from memory

i swar by goldwave, is audacity much more capable? effects and filter wise?

Adobe Soundbooth alll the way. If you are on mac, Logic 8 Pro

audacity.

adobe audition.

adobe soundbooth.