I've been on a couple in their London HQ.
They have an 'intro to spreadbetting' seminar which is just a general overview. It's good for asking questions and speaking to the traders to understand exactly how things work.
They also do a technical analysis seminar. The guy who presented it (can't remember his name, but he was their chief Technical Analyst) obviously knew his stuff, but was one of the worst presenters I have ever come across. It was fairly standard TA stuff - trendlines, fib etc. You can get his daily charts off their website.
p.s. they feed and water you after the seminar which is very nice of them, and I got a golf umbrella so all in all a good deal for a free evening.