ia_archiver is currently busy taking up bandwidth on WebPriceCheck.co.uk; so I would recommend anyone running Price Tapestry to block this particular crawler. I don't normally block ia_archiver on my other sites because it can come in handy; but on a site with thousands of pages I don't see any point in having pages stored by archive.org.
I don't include a robots.txt in the distribution because it's down to personal preference what you do and don't block, but here's what i'm using at the moment:
http://www.webpricecheck.co.uk/robots.txt
More info on ia_archiver:
