I am going to record a semi-professional musical with my XL-H1 and was wondering if people here have done the same and if they could give me any advice on which settings I should use. I also would like to have some general advice on things I should look after and maybe possible pitfalls. This is the first time that I am going to shoot a musical so all advice is appreciated.

These aren't specific to the H1, but here's a collection of threads on the topic of shooting live performances:

http://www.dvinfo.net/conf/showthread.php?t=60275