Thanks Craig. My workflow is basically this:
Cards get downloaded (via Breeze Downloader Pro) to a new folder for the shoot automatically created in \My Pictures\Pending and named by date and subject, e.g., \My Pictures\Pending\091011 GBHSvb for an Oct 11 varsity boys soccer match at Great Big High School. I cull the discards (using fullscreen sharpened views via BreezeBrowser Pro), then process the keepers, traditionally (using C1 3.7.x) to a \Develops folder inside the source folder. Then I upload the gallery (also generated with BB PRo) to my website and move the source folder with its contents to a subject-matter archive folder like \Soccer 2009, renaming it in the process to something a little more descriptive like \091011 GBHSvb Little Bitty DONE (where Little Bitty HS is the opponent). That way I know it's done, and I know where to find it, even five years from now. (BTW, the shots themselves get auto-renamed on download to, e.g., 091011-GBHSvb-001.cr2, and they also get automatically backed up to an external drive. The \Pending and subject matter folders also get auto-backed to another external drive.)
After a while, when the print orders are done, I go back and delete the \Develops folders to save space, saving only the .cr2's longterm.
So, under a similar regime with 5.x, if I just name each session Session, and it lives within its respective source folder, won't I be OK? Mind you, I'm still more than a little unclear about the use and usefulness of sessions in the first place, as I've never used them at all with 3.7.x.
I'm on Windows, if it matters.