travel in europe and updating a site

I will be travelling soon and need to maintain a website while gone.  I've
tried to prepare myself with proper power supplies, phone adapters, net
connections, etc, but the uncertainty of connections remains to be seen.
I'd like to ask for ideas of ways to post information on a site  if/when all
should fail, and i needed to keep viewers of this site informed.  I was
thinking perhaps a "public guestbook"  which could be accessed and written
to from ANY net connection, and not just my own laptop or even my own floppy
uploads..         Does anyone have any other suggestions for getting info up
on a site without the benefits of normal software for this?

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