I've done this on numerous occasions, sometimes by e-mail, sometimes by fax, sometimes by phone (but usually at least a couple weeks prior to the stay). Results vary widely, depending on the manager and his/her priorities. Getting the e-mail address of the GM is not very easy (although it depends on the property), fax/phone numbers are much easier to find.

[This message has been edited by Eugene (edited 02-26-2003).]