LR3: Want to Organize Develop Presets
You can R-click on any of your user presets or preset folders to create a new folder. Then just organize into categories by dragging and dropping. One such folder could be used for your "Most Used" presets for example.
Haven't done it myself, but I think that's how it works.
|_F0A5334-Edit_small by Dester Wallaboo|
from Open Air Fashion Photography
|Old Harry's Rocks by John93Robertson|
from View from the top - Sea