Updated TODO

Ignore-this: 3e6df4e2fa020e69cfed71463fb6b71

darcs-hash:20090601083608-1e3d8-d1faff9dd2dac9942d0ba74a9a6dd8dae28fc520
Update Readme with presence related functionality

darcs-hash:20090601090723-58252-50bbdc70cf5e2da3f95a499b38be3b1e9a05ae2e