Well I have a decent sized store of on-going class projects such as: Alt.Core Classes that allow more flexibility, various PrCs (who doesnt have some?), and the following new classes: Alchemist, Ascetic, Arcanite, Crusader, Duelist (in my sig), Holy Warrior, Jordain (from FR), Mystic, Priest, Primalist (in my sig), Psi-Knight (based on Green Ronin's Psychic system), Runesmith, Skinwalker, Theurgist, Warder, Warlock, and Witch (here).
They tend to be my niche on the game mechanics design side. Just enjoy writting them. However, overall, I tend I find it hard to balance for the "lower power" game mechanics types. For example I tend to find the skill point system too weak, and up all classes by 2 points per level as I prefer more skill to bashing (not that there isnt a place for combat).
Lately I have been working on a tweak to the fighter class after our own dislike of the class and reading the following threads:
http://boards1.wizards.com/showthread.php?t=307454&highlight=Fighter
http://boards1.wizards.com/showthread.php?t=305417
What I have been working on is taking the ideas from D20 Modern and applying it to the Fighter class. Basically adding choices for initial fighter training background and later on advanced training choices.
This serves to basically improving a Fighter's abilities (as most see them weak compared to may other classes), as well as broadening their spectrum of abilities so they arent all a tin can with a sword that bashes on whatever you tell them to.
I also recently found the Ultimate Fighter (and all his other clases) by Szatany (due to a poster here) and seems like he was heading in the same direction, but not quite as much detail. I will likely use a few of his ideas in my own Alt.Fighter.
http://boards1.wizards.com/showthread.php?t=169285
