Thanks, folks... It didn't occur to me that portability and scheduled operation aren't really compatible, but I see what you mean. I think I should drop "portable" in favour of "no-install," i.e., not needing full admin rights on the computer (tinjaw, you hit the nail on the head). That still leaves me feeling uneasy at FDM, for example, which in "portable" mode still writes to the host computer's Registry. It clears up when it exits, but that won't happen in a crash, and also apparently doesn't remember all its settings when used in portable mode. There's a message in their forums about this, without any replies.
I'm not so bothered about browser integration as I expect to compile lists of URLs manually. There are utilities like tranglos' VISIT, for example, which capture URLs from the clipboard (I haven't tried this one yet). I assume most host computers will already have schedulers built-in. I normally use the one in PowerPro, but could use something else if necessary.
@iphigenie:
i find this http://www.webxpace....et/software/#Downldr - i havent tried it much and most of it is controlled via a text config, but it seems to be an "unpack and run straight" type of tool
That looks nice, small and truly portable. Apparently the author listens to his "customers," too. However, it doesn't understand proxy.pac files, nor is there any provision I can see for scheduling. Star Downloader is another one that expects you to have fixed proxy details, which rules it out for me.
Much kudos to Martin Aignesberger for WebSite-Watcher and Local Website Archive, also to Firefox, K-Meleon and Great News, all of which can be set to use whatever proxy stuff IE is using.
@4wd:
I was scared of wget on the grounds I probably wouldn't understand GNUishness
I suppose I'll have not choice but to check it out! Thanks for the link, especially for the GUI shells.