Could we perhaps get some sort of roadmap indicating probable future development added either to the site or the documentation?
It looks like you're developing an excellent little library here, and it certainly looks like something I'll be happy to recommend to others once I've had the chance to play with it a bit more myself, but it would be nice to have an idea of what additions are planned for future versions and perhaps a rough indication of priority between planned features and what is likely to constitute a new stable release.
In any event, congrats on the excellent progress thus far, SFML looks very clean and well set out.