I am in the processes of setting up nightly builds for blender on Linux (32 & 64 bit) and possibly Irix. Here is a link to my site if you are interested. Currently only 32bit is uploaded.
If someone is willing to give me ssh accsess to a Mac, I could configure it to upload nightly builds as well. A windows nightly build may never happen (if someone sets it up on their machine I will lend them webspace).