I would like to see someone create a sort of "ghost" website for the main real estate advertising websites (realestate.com, allhomes.com.au in ACT etc). which links to the information on the main website but adds greater functionality--foremost among them being the ability to comment on the property advertisements. i imagine that this would open up all sorts of legal troubles, however. you could probably get around the copyright restrictions if you make it so that you don't carry any of actual information on your website (just have the original website pop up beside whatever listing you are viewing), but i guess it would be a bit risky in terms of people trying to hold the website owner responsible for the comments people post (esp. if they are seen as contributing to a sale falling through, etc.)
but seriously, some of the crap written in these online ads is so over-the-top the ability for people who live in the area to bring them back down to reality would be nice.
hop to it techies. base it in jamaica or something (where ever the now-indicted poker sites used) so you don't have to deal with lawsuits. and try to get it done by the end of the week, if you don't mind