I'm giving Trello a go as a shared/hosted bug tracking / wish list tool.
Go to the TravellerMap.com Wish List Board
Does this work for you? Try adding some items and comments. To much structure, not enough? My other options include a shared Google Spreadsheet, or a the bug tracker in a code.google.com/p project. (even though the site's code is not hosted there).
What are your thoughts?