This is a really really good video tutorial on Beatgridding from dubspot:
As much as i hate beatgridding (try doing it for 1000's of your tracks!!!) - the benefits are really nice. Perfectly Quantized looping, Perfectly Quantized BeatJumps / Hotcue Juggling , Spot on FX Integration and so on...
With the Pioneer REKORDBOX Quantize feature , i hope someone will create a conversion thingie that converts every single Traktor Beatgrids into the Rekordbox Library (and maybe Serato? When they have beatgrids finally implemented?) - Seriously who can be bothered to do it all over again?