I just bought my chiller and I now officially have everything I need to go all grain!
I was originally going to build my own, but after I saw the prices on copper tubing and fittings, I decided against it.
50' of 1/2" at coppertubingsales is $50.99 with $16-17 shipping ($82 at Home Depot, $103 at Lowes) The female and male garden hose adapters are $5-6 each at Lowes. The four 3/8" copper elbows are $2.12 each. The soldering kit I bought was $20. That's well over $100 right there, plus the time it takes to make the thing.
Just thought I'd point this out to anyone who needs a chiller. Forrest at Austinhomebrew is having his sale starting tomorrow, maybe he'll have some on sale.