New to SFML on the Mac OS X (10.6.7) and I just noticed an odd warning, not sure if its something useful to report.
This happens while exiting the open GL sample (OpenGL.cpp) using SFML 2 (x86_64) with the following being written into console output:
2011-06-03 12:39:17.366 sample[12443:307] *** attempt to pop an unknown autorelease pool (0x100876e00)
Anyway, keep up the great work guys!