Here's an interesting idea. Microsoft's Search Together claims to "allows groups of people to collaborate on Web searches" This is quite an ambiguous definition, but in theory is a good concept. Normally you have groups of people standing round a computer offering suggestions while one person types. This can be quite inefficient. If people could collaborate on this searching could become a lot more productive. Only problem is, it's restricted to IE and Windows / MSN.
Anyone interested in helping me develop an open alternative, with either PHP or perhaps the Google AppEngine Python framework?