Sources of rates for homebrew automated analysis?

Hi folks, great site.

I’m interested in writing a homebrew simple automated advisor (Calling it an “expert” advisor would be optimistic ;)). Effectively I’m looking for a source of rates updated somewhat frequently, say 10 minutes max, that I could use in an application.

Optimally this would be something like an RSS feed. Any suggestions on where to look, or if this is even possible?

Looking forward, what I’m interested in doing is a Matlab/Octave thingy to do some basic pattern rec on candlestick charts to identify likely trends. Nothing terribly fancy, I’m more interested in getting a basic system up than doing something amazing right off the bat.

Any information is appreciated!