Recently I found this website offering presets for use with Guitar Rig 4 and Guitar Rig 5.
Many downloads are free with a premium service available.
3,600 presets for $50 and $33 for a limited time (pay with paypal)
After trying the free downloads the sounds of the presets seem of a good quality and are possibly better than the presets that come with the software.
In the free downloads were some really handy sounds and the acoustic simulator was particularly good. Well worth a try.
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