How are you measuring ROI on your marketing efforts?
Depending on what you would consider ROI. I personally did enough biz at internext where my overall cost to attend has been recuperated and that is without doing my follow ups. Anything generated through my follow ups will be profit.
How long does it take you to recoup your investment on a tradeshow? How do the tradeshows compare for you???
I personally prefer trade shows that are industry only events. Phoenix and FL show are my 2 favorite shows in the year. As much as I love Las Vegas I find that attending shows there tend to side track people to do other things aside from business which does not make those shows as productive. And there is nothing worse than talking to someone at the bar for 5mins only to discover that they are a tourist and are not in the industry. (especially after buying them a drink! LOL)
If you could see immediate ROI would you attend / sponsor / shows again?
DUH! LOL YES 
How many shows is the right amount for an industry?
I am happy to attend 1 show every 2-3 months but I include consumer shows in that number so realistically that is say 3 B2B shows a year.
If you had one single show that you would attend, which one would it be?
Phoenix forum, lunch is included, snack shack is a blessing especially for early morning coffee and late night snacking and being that the entire hotel is booked keeps the affair intimate.
Webmasters- If it was free would you go?
Phoenix was once a free show to attend and when that was the case there was a huge turn out. There is still a huge turn out for that show but the affiliate niche of attendees definitely thinned out. If badges to a show were free it would be more likely that the event hotel would be sold out and overall attendance would be greater.
Programs - Would you pay to sponsor webmasters if you were gauranteed traffic?
Yes! I was bull shitting with someone earlier this year about offering a promotional campaign to all their affiliates. The concept was if you send X amount of sign ups you would get an all inclusive trip to a show. These are the kinds of things that are desperately needed however with the overall cost of shows these days it would require a much larger amount of sales to make it of value for any affiliate program to pay for their affiliates to attend.
My 2 cents about internext this past weekend....
The show appeared to have less attendance than previous years however it was extremely productive for me. I met lots of new people, seen lots of old ones and managed to accomplish what it was that I set out to do as well as much more.
Overall experience - 9/10
(I dropped a number cos I am holding the show coordinators responsible for my tremendous hang over on Saturday morning! lol)