Here are some links to other web resources. This list isn't meant to be exhaustive but only really concentrates on sites which add something to what is already on my site.
Yahoo Clubs - Eaton
An on-line Upstairs, Downstairs forum is available. After a busy start, the group now has less postings than it once did, but you may enjoy looking through the archives.
Wikipedia entry for the classic show (http://en.wikipedia.org/wiki/Upstairs,_Downstairs_(1971_TV_series))
The Wikipedia is an attempt to create a huge global on-line encyclopaedia, with experts all coming together to write articles in their own areas of expertise. Our favourite show now has a very nice entry, with lots of details of characters and backgrounds which are not dealt with on this site. Well worth a click.
Wikipedia entry for the new show (http://en.wikipedia.org/wiki/Upstairs_Downstairs_(2010_TV_series))
Wikipedia entry for the new version of Upstairs, Downstairs.
Internet Movie Database
Finally, after years of television playing second fiddle to the movie entries, the IMDb is finally improving its TV programme details by incorporating episode-by-episodes listings for TV series. So you can now find synopses and episode-specific cast listings - courtesy of Daniel Kelly who typed it all in! At the bottom of the page is a UD forum.
This contains synopses for all the episodes, mostly written by Hal Erickson. Generally very good (the synopses are a bit longer in most cases than mine) but occasional nonsense such as: "A Cry for Help originally aired ... as the sixth and final episode of Upstairs, Downstairs' trial BBC run," sometimes lets things down a bit.
Haus am Eaton Place (http://www.tvsi.de/familienserien/haus_am_eaton_place.php)
Synopses, in German, of the 52 episodes seen in Germany. Interestingly, the episodes "missing" in the German run seem to be nothing to do with those omitted from the US run.
synopses of the episodes (http://www.pbs.org/wgbh/masterpiece/archive/archive.html)
Synopses of the original 55 episodes shown in the States (type "Upstairs Downstairs" in the search box for "Program or Episode Title:") although synopses for the last season are not included, for some reason. The cast lists are also all over the place (use mine on this site instead!)
DigitallyOBSESSED DVD reviews
(Type "Upstairs Downstairs" into the search box). Nice reviews, episode by episode, of the 5 US DVD sets. Reviewer Jeff Ulmer has been unnecessarily kind to A&E in terms of the terrible picture quality of these releases, and some of his statements like "...the image has degraded significantly in the intervening years", "The transfer doesn't seem to add anything more detrimental to the source than is already there", and "To their credit, A&E, does make mention on the outer box to expect a sub par presentation, despite their efforts to locate the best quality source material", demonstrate a naivety as to the potential DVD picture quality available from 1970's 2" quad tapes (cf. the BBC's Doctor Who releases, amongst others).