@ Mention functionality does not exist within the Shotgun web UI but would love to see it. It does appear in SG Review for RV (which is built on Toolkit).
Similar to other web services (ie facebook, twitter, etc...) would love to be able to @ people in Notes in the Web UI. example:
@dparker need to tweak the RGB value on that pixel from 255,255,255 to 255,254,255
