I realize this is probably a work in progress, but as a suggestion, it would really benefit from better navigation:

- Sorting (particularly by # of volunteers, to find ones that aren't filled up)

- Searching by string

- Maybe tags that can be searched by? (skillsets wanted, etc.)

- Projects could list an estimated number of needed volunteers; "Does 86 mean they don't need any more?"

Overall, excellent idea and it looks great so far. I just think the above would make it much easier for people to find the right place to contribute.