Here's a handy site I found, it's a guitar tuner and it works with a computer mic, so you can tune acoustics easily, I found it really hard to tune my acoustic until I foiund this, I hope someone enjoys it.

http://www.aptuner.com/cgi-bin/aptuner/apmain.html

And, no, it is not spyware, a virus etc, I scanned it.