For a couple of days I switched to using the Guardian RSS feeds as starting urls for iSilo, linked to an html page stored locally. Worked OK, a bit of extraneous stuff at the top of each page, but not a showstopper, but...
...as of today, Guardian Online is back and fully functional at both
www.guardian.co.uk/pda and
www.guardian.co.uk/pda/avantgo 