Well that was fun. I just did a webcast with DCC Glen Gordon on MARS, a new feature of SQL Server2005 that is leveraged in ADO.NET 2.0. (I'll post a link to the on-demand version of it when it gets posted)

Although I have looked at, experimented with, presented on and written about MARS previously, this was the deepest I have gotten into it. Glen and I had a lot of interesting talks in advance of doing the webcast. One thing that I really have learned a lot more about is transactions, where we can benefit from MARS the most.

Doing a webcast is fun, but for me the downside is not having the interaction with a group of people that you get doing a live presentation. You can see on people's faces when something is confusing, or if you are going on a little too long about something you may think is really fascinating, but they don't. and make adjustments as you go along.

MARS is very powerful, but it's so important to understand what it does and how it works before you start leveraging it. Otherwise you have the potential, as Christian Kleinerman says in his excellent MARS article, to really shoot yourself in the foot!