There's already been a sizeable response so far, but if you haven't had your say yet, please head on over and leave a comment soon. I'll write up a summary of the suggested requirements on Monday.

The idea behind the aggregator is to provide a single place for developers to look (besides the PEAR site, of course) for PEAR packages they might find useful. The key here is that the aggregator would be bringing together the independent channels out there and making them simpler to find. Feature suggestions so far include: showing where the library lives (like github or bitbucket), creating a proxy channel for a "single install" location and customized lists of a user's "in use" and "tracked" packages.