The full list of speakers for Rails Underground is now up, I thought  
I'd pass it on:
Pat Allan
Paul Campbell
Ariejan de Vroom
Obie Fernandez
Geoffrey Grosenbach
David Heinemeier Hansson (via video link)
Jason Hoffman
Lindsay Holmwood
Elise Huard
Yehuda Katz
Martin Kleppmann
Clemens Kofler
Brendan G. Lim
Desi McAdam
Eleanor McHugh
Gwyn Morfey
Paolo Negri
Charles Nutter
George Palmer
Robby Russell
Maik Schmidt
Ben Scofield
Vladimir Tarasov
Jim Weirich
Joseph Wilk
Dr Nic Williams
Laurie Young

Full details are at http://www.rails-underground.com/09-conference-speakers.html

It's very exciting to have such an excellent line-up of awesome talks!  
The schedule and full details on each talk will be coming out over the  
next 2 or 3 days, as soon as I can type them up... but I couldn't wait  
any longer to get the line-up out there...

As well as the scheduled talks, we're planning a session of lightning  
talks in the evening, where anyone can put their name down to give an  
impromptu, short (say, 10 minute) talk on any subject they like...  
We'll also have an 'open mic' at lunch times for people to make short  
announcements or introductions. For example, job opportunities, a  
quick introduction for a company or new product, or just to say 'Hi'  
and show your face.

We also have a slot available for a workshop for the day before the  
conference, details are TBC, so if you have any ideas, shout out!

Cheers,
Mark

Rails Underground: London Rails Conference, 24-25 July '09
http://www.rails-underground.com/
http://twitter.com/railsunder