I don't know if I ever mentioned this here:
I work at a secure government facility. Accordingly, web browsing is done through a filtering proxy that blocks access to certain sites because of content or for security reasons. These sites include, but are not limited to:
So if you leave me a message there, though I might get notification of such, I can't answer until the evening on week nights.
Additionally, I work in an egg carton (euphemistically referred to as "cubicles"), so to keep the noise pollution down I keep the sound turned off. So, though I am usually logged in to Gmail (and hence Google Chat), I don't have any audio cues when someone writes to me or responds in chat, and I don't always notice the taskbar entry blinking. Don't be offended or worried if I don't respond right away.
Thanks. Just thought I'd mention that.