Fast Company is one of my must-read monthly magazines. I read it cover to cover, and subscribe to a number of daily or weekly emails as well.  Here’s a snippet and a link to an article from one of the emails. Those of us who speak regularly (I think I gave over 30 speeches in 2008 before the economy tanked), and attend others as well, have to be rigorous in determining which voluntary ones are worth the effort. 
Here’s a tongue-in-cheek article from Fast Company that offers some “guidance” re how to determine which programs to attend:
How to Tell if a Conference Is Travel-Worthy or a Time Waster
BY: NANCY LUBLIN  January 12, 2011

There are a lot of professional conferences to attend, and Nancy Lublin knows how to find the ones that are worth your while.
Confession: I’m addicted. Signs of my habit hang around my neck like a noose. Evidence is in my pockets, my tote bags, my calendar. My eyes have dark circles, and I’m distracted at work. It’s true: I’m a conference junkie. 
The obvious conclusion is that not all of these events are deserving of my time. But what makes a conference worth it? I took up the issue with some friends — while we stood around chatting after a panel at a conference in New Orleans.
Andres Glusman, Meetup’s vice president of strategy, said that a good conference has to include two things: social fun and actual learning. Danielle Brigida, the digital marketing manager for the National Wildlife Federation, added that warm weather helps.
. . . .
Travel-Worthy or Time Waster? 
Take Nancy‘s Quiz Before Attending Your Next Conference.
1. People.
The conference is:
a) invite-only
b) open to anyone, but some of the attendees are people you are dying to meet
c) open to anyone but focused on a niche topic you love, so you might bond with a few good folks
d) the equivalent of a buffet in Atlantic City: open to everyone, cheap, and a little bit dirty.
2. Location.
The conference is in:
a) the city where you live and/or work
b) a location you’re dying to visit
c) an undesirable market but within three hours’ commute
d) Cleveland.
3. Timing. 
The conference will take place:
a) over three workdays during a slow period at the office
b) over a non-holiday weekend and includes an open bar
c) during that Lady Gaga concert you were planning to see
d) on the same weekend as your sister’s wedding.
. . .
Illustration by Frank Chimero. Illustration and article, copyright (c) Fast Company.