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I like the toggle widgets that ship with my new Arc S but there isn't one to turn off auto-refresh to stop Google, Facebook, Twitter, etc. from updating when I am at work where the 3G signal is terrible. I thought I'd try the 'Data Traffic' widget but as far as I can tell this stops ANY data from working so I can't do a manual refresh of Facebook, etc.
I used to use the stock Android Power Widget but this is missing from the Arc.
I guess I can download a 3rd-party widget but I'd really like a SE-style one...
you can set the refresh time for this..
go to settings > accounts and sync..
and turn off the auto sync..
just disable it and no application will refresh automatically and you can manually refresh the fb as well 
Yep, I realise I can do that but I would prefer if SE had supplied an on/off widget for this like they did other settings like WiFi, GPS, etc. Seems like a strange ommision especially when the stock Android Power Widget isn't included.
I miss that widget too, but
you can download this
Power Control Widget
it's the same thing but you can customize it