Perhaps checking out some of these threads (three separate ones linked) is in order. Byuusama goes by Byuusan on these forums. Needless to say, there's been quite the copyright witchhunt in the past few weeks on (from what I can tell) the solo songs and most things that've recently came out on CD. Makes me QUITE reluctant to go back into the request game, myself, since I do more than pure iM@S.
Domelola IS, in fact, on Nico Nico Douga, where he uploads some of Miku-tan's covers to NND along with some others, to my knowledge. NND is blocked on my computer as well, so the best I can get you is a link to one of Miku-tan's songs, where you can scroll down to where it says "domelola" and click on that. After that, there should be a link that looks like it has a picture of movie film in front of the kanji. If I remember correctly, clicking that should take you to domelola's mylist. You can explore that and see if any of his iM@S-related videos made it on there. :3 Here's the link to Miku-tan's video. Best I can get you, but someone without overprotective parents can probably link you directly to the mylist.
Thanks! I checked it out, but he doesn't seem to have much any im@s stuff on his channel. Oh, well I expected this. Doesn't make much sense uploading eng subbed vids on nico after all.
His other YouTube account, domelola2nd, is still there last I checked. You should be able to find a few videos still there.
Nope, he got terminated from Youtube (most likely by RIAJ). It's unfortunate but I'm not much a fan of his translations so I can't help you much there.