[aggronn]

You know what I miss for instant support? IRC. It combines with instant gratification of phone calls with the crowd-support of forums or community support portals.

IRC obviously isn't mainstream and lacks features that some other systems have, but whenever I'm working on something and want a quick question answered that I can't get via google, I look for an IRC channel first.

[orliesaurus]

A lot of services(slack,hipchat) are nowadays allowing guest-joins; basically it's like IRC, but with only channels(public , private) for your team/customers.

[agerlic]

You also have HipChat web public rooms which are awesome. But it can't replace the direct feedback you have with phone.