Hi,
iChat is good for this.
As some have said I list my email in my Profile.
With the previous forum software I did get some people apparently "Queue Jumping".
It was very similar to posting "Bump" in a thread to move it to the top.
I have system where I respond to Subscription alerts first then work through the oldest Unread post in a Forum Community (or Refined view).
If someone does email me and I come across a thread as well I point out the queue jumping nature of doing this and ask they donate to my Site for "work at home".
Of course I also have this page which does have iChat Links on it. (if iChat is set to be your AIM app then it will open iChat and Message me)
Every now an then I do get someone who will try to abuse the offer. (Video invites without Texting first, blank screens and silly noises out of sight and so on) I eventually end up blocking these people. (in seven years my list is still less than 15 people)
I subscribe to the idea that answers should be available to all.
Having said that I can see that asking a specific person to have a look at a thread might be useful. That said I think that it would not get that used by myself due to where I help out the most.
I think on the whole I would give it a miss.
8:23 PM Thursday; June 2, 2011
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb( 10.6.7)
Mac OS X (10.6.7),
"Limit the Logs to the Bits above Binary Images." No, Seriously