Someone PM'd me asking how to use a brush set onces they've downloaded it. I realized some of the less experienced members would have no idea how to install a brush set. So here you go:
1. Close photoshop. Close all Adobe applications if you can.
2. Download the brush set Bluesfear has a couple good sets in their download section.
3. Move the .ABR file to your photoshop directory. Unless you changed the directory at install it should be C:/Program Files/Adobe/Photoshop x.x/Presets/Brushes/
4. Start Photoshop and make a new document, any size will work
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7.Select the brush set you want to use.
8. At this point you will be asked if you want to replace the current brushes. "OK" will make the new brush set the only set available from the scrolling list. "Cancel" will do nothing. "Append" will add the new brushes to the current list of brushes. Either OK or Append will work. If you want to go back to the default brush set simply click on the "Reset Brushes..." selection, which can be seen in Step 7.
9. Paint away. With most brush sets, especially grunge, you don't actually want to "paint" with them. Use them more like stamps; move the mouse where you want it to be, click, release. Tada!
**NOTE**
If you add a brush set to your Brushes folder, it will not show up on the list until Photoshop is restarted. If you can't reload photoshop because you're in the middle of a project you can choose the "Load Brushes..." option, visible in step 7.
If you have any questions you can PM me.