Since I don't like giving out my real name, we'll just go with Terashell for this... I haven't done any prior voice acting, but I plan on doing at least a little for my own campaign when I actually have time/FRED skills. I have, I guess, a regular american accent... I don't know if it really differs from other areas that are in the northern U.S. I can mimic a pretty decent Irish accent, Non-specific British ("Northern" i.e. Christopher Eccleston and a vaguely bastard Cockney), with some work, I can get into a southern accent and occasionally I can pull off a Russian accent. I can do bass and tenor speech modes, and have a "demonic" voice I can do in small parts if someone finally wants to give Voice to the shivans (a little technical manipulation and it'd be perfect). I'm also pretty good at acting out emotions. Helps I was in drama clubs and classes for quite a bit, and really wanted to get into voice acting when I was in high school. Still do.
If I had recording software, I'd provide samples. I also don't have anywhere to upload them ^^;
If I screwed up this post, just delete it and PM me.