I have been playing with the idea of updating the Orcus game to my 4.5 Edition framework (mainly reworking the monsters), but also adopting the threat levels of the encounters. With the 4.5 edition I think you could make the game play at least twice as fast than the original - allowing for more focus on exploration and roleplaying.
However, right now I have spent nearly a year creating a 4.5 Edition framework in MapTools so that I can build in much of the rules into macros so I do not have to spend so much time on being a rules lawyer and securing player adherance to the rules, as well as minimizing the need for record keeping (for monster HP, etc). I have also built it for live and online mode. So when we play online, you are requested to roll your hit and damage dices and feed them in, and then MapTools take care of the rest for you.
The greatest effect is when I use it on ISOMETRIC maps and tokens that automatically create the effects of fireballs, etc. on the map, it becomes quite visual.