Hi Joe,
I got back last week from Uganda. It was my second visit (first was 6yrs ago). I spent most of my time with an organization called Restoration of Hope. Website is http://www.restorationofhope.org/ They are located around Jinja. They help numerous villages, two schools, a medical clinic, women's co-operative etc etc .........
I don't know what kind of volunteering you are looking for but they need lots of different things. You could help teach English, help rebuild classrooms, plaster the class walls, organize soccer games with the kids, help the overworked teachers, etc etc. There is lots of things to do. Unfortunately we ran out of time or we would have done more. They need money, clothings for the kids, school supplies,medical supplies etc etc so try to bring any items from home that you no longer need.
We ended up purchasing goats/chickens for the women's co-operative, buying school uniforms/desks, drilling a bore hole etc. I know what you mean about where is the money going but with this organization, you actually have a hands on approach. We physically gave the items brought to the children along with the newly purchased school uniforms. We saw the bore hole that we financed almost completed in the short time we were there. We passed the goats and chickens over the the women that would be sharing them until they had offspring of their own.
Anyway, you will have a wonderful time. Contact Ronald Mugabi at Restoration of Hope and he can definitely give you a better idea of what you would be suited for. Let me know if you have any questions.
Kelly