Detunized has released a new "Live Pack" sample library of guitar samples. This pack also contains 50 side noises, including various string squeaks and scrapes. The pack is compatible with Windows and Mac, and is available for download from Detunized for € 9.00 (about $12 USD). Take a look at their site. Even if this pack isn't quiet what you're looking for, they have plenty to browse through.
For more information, read here: http://en.audiofanzine.com/virtual-guitar/detunized/dts044-guitar/news/a.play,n.14890.html