Ok, some of these are in definitely in the same vein as existing offerings, but that doesn't mean there's not room to do them (a lot) better. Also, as others have set a precedent of suggesting domain names, I'm including some that seem relevant yet are still available.
sealtheleak.com - All airtights, though not shot with the kind of coercive vibe of HerFirstDP or that kind of thing. In my opinion, it's a bit too uncomfortably sketchy to portray it as being semi-consensual, but to each their own.
gokkunts.com - A gokkun (bulk swallow, one(ish) girl, lots of shooters) site. Given the organizational overhead with people-wrangling for this, I'd expect it'd have to be an every-two-weeks site for updates... at best. That said, it'd probably be a similar headcount to RK's InTheVIP product, though probably much less expensive to execute. As a few of the other posters have pointed out, there are a lot of east-asian porn consumers, and bukkake/gokkun seems to be relatively underdeveloped as a marketspace in western net porn. The relevant DVD serieses aside, most European, and virtually all US, produced swallowing sites kinda miss the boat for matching that niche.
screwsyourownadventure.com - Something of a meta-suggestion, with a name targeting the book series that guys growing up in the 1980s US would be almost inherently familiar with. An entirely suggestion/voting based site, where a bunch of aspects of each shoot are open to suggestion (within reason) and then the suggestions chosen by your staff as feasible (the code for this shouldn't be too bad) are subsequently available for voting by the memberbase. I would think this could be most efficiently managed by using the same pool of suggestions for multiple sets of votes/shoots, striking the already shot option(s) from the pool each time, before going around for another batch of ideas. There could also be wishlist functionality for stuff that wasn't entirely feasible at the time (certain stars with poor availability perhaps), but that could be kept around for reference should circumstances shift. Speaking of stars, that'd probably be one aspect that would be too cumbersome to leave open to suggestion, but it'd be neat if it was still available for voting among the business-compatible options. (Alternately, coozyourownadventure.com also seems to be available.)
twatsupthere.com - I don't know if you'd see any merit to this, but it would be an insertion-oriented site, possibly featuring two sub-genres within it. 1) solo girls doing interesting/impressive things in that regard (though more like FTV type stuff than, say, Denny-O (that's just tooo far) ). 2) insertion-related competitions between multiple girls. One idea that comes to mind for the latter, based on an tale once recounted to me by a camgirl, would be a challenge to see which girl could pack the most underwear inside herself, as if she were having to travel without luggage. (Yes, I know this one is weird, but you did open it up to crazy suggestions...)
cummunitytheater.com - So, it seems like a fair bit of the current crop of on-camera talent has an urge to get more of a chance to display their acting chops (Voodoo, if you're reading this, I'm looking at you), and I'm sure a fair portion of your viewership has, at one time or another, been dragged to a community or school theater production where they just sat there, wishing it would be over sooner, or that at least something interesting would happen. In the occasional, rare case, there may even have been a local hottie in the show that they'd be able to daydream about while wishing it was over. Given these factors, and the amount of public domain and inexpensive scripts out there, I think it'd be interesting to have a site where a community-theater style production (clearly with a small cast) is put on by the talent, based on normal plays with sex interjected where appropriate (and at least once per act). A three-act play could be shot at one time, and then each act would make for a separate weekly update. I tend to think the talent could have fun with it, and, provided a suitable location for it was found, you could probably even have fans actually populating the audience (off camera, but with audible reaction) rather easily. Also, as RK seems to have identified that there's a surprisingly broad appeal to bodypainting (not really my thing, but with the amount they hire body paint artists...), perhaps even "prop building" episodes could be produced, probably with a lesbian bent, where the set decorators get naughty. And no, I've never been involved in theater in my life ... though I was one of the lucky guys that most of the shows I got dragged to by well-meaning relatives or friends had at least one eye-candy girl I could sit there wishing was naked... so ... I think on a lot of levels this could be a hoot. Or maybe I'm just crazy. Oh, also, for added authenticity, this could potentially even be shot with a fixed camera position.
I've got some more ideas trying to get out, but as I've probably already typed enough to drive you cross-eyed, not to mention go well beyond the attention span of the others reading this thread, I'll cut it short (ok, medium perhaps?) for now.
Cheers
P.S. If you actually read this far, thanks.