API:Other services

OpenSearch Suggestions support (done)
This module allows web browsers (Firefox 2.0 at this time) an auto-suggest functionality in the search box. The module needs to be extremely fast, and provide a simple JSON-formatted output in the form of

Since the server might be hit on every user keystroke, the potential server load might be so heavy as to move this feature to separate server(s).

WatchList RSS/ATOM feeds (done)
This module returns watchlist data in a feed format. The potential performance impact is still being evaluated.