Just wanted to give a progress update to everyone:
I'm still trying to rearrange my work stuff to take a more active role in reviving 
Gallio, but don't yet know how much time I'll have to devote yet. I'll give an update as soon as I know more.
To Mike and any others who have expressed an interest in playing a more active role in 
Gallio development (and also for those that have kept such an interest silent :) ), thank you! If you want to get started right away, I encourage you to start familiarizing yourself with the project source code, and also to consciously decide which area(s) of the project interest you most. Since we don't have an 'active' project leader right now, coordinating the involvement of new participants is a bit difficult at the moment, but hopefully that will be addressed in the very near future.
Another 'first step' is to help get the 
nUnit/
MbUnit (or 
MbUnit/
nUnit, if you like) collaborative comparison completed. I feel that having such a comparison will not only be a big benefit to the .NET testing community, it will also help the leader of the 
Gallio/
MbUnit project (whoever it may be) make some important decisions about the future directions and the 
roadmap of the project. Charlie and I have already had a fairly in depth discussion on the matter, and we both agree that it is also the first step between a closer collaboration (and a less competitive relationship) between the 
Gallio and 
nUnit projects and development communities.
So I encourage any interested in helping with that effort to do so.