I saw your question earlier--before the plea for responses--but didn't say anything because I didn't know for sure.
I see about 8 plays a year, for the last 15 years or so. It's a rare one that has no intermission, and while I can't bring every single play to mind (especially the ones I'm valiently struggling to forget), all the plays I can remember as having no intermission also had no separate acts. They were oddly-structured, either gimmicky (audience interaction, or variable plots depending on an un-plannable event like the role of a die) or super-long one-acts with no changes in scene or jumps in time.
I don't consider myself well-versed in more edgy or experimental theatre at all, so if that's the appropriate venue for what you're working on, I disqualify myself. Perhaps they do no-intermission plays with defined acts all the time.
Is there a regional theatre or a rep company where you live? I would think that a local director might know heaps more than I do. (I'm sure the local directors here do.)
Anyway, nice to meet you. The plays board moves v-e-r-y slowly, as you'll see, but I'm not the only one who peeps in hoping for a new message.
Maryn, who wrote one-count-'em-one play