Here is some cool trading SOFTWARE you can get.. You can make trades and be alerted about intrest in your items while your playing GW. Its pretty cool. There are no real help files but its pretty easy to use.. There are some screen shots of some of the earlier versions of it. It does much more than it shows.. There is an auction house there too for thoughs of you that dont know how much to sale an item for. you should check it out.
www.gwtradingpost.com