Hi there,
i`m searching this site every time i have to create a complexer formula. So this time, i thought, i put it in my blog as a reminder 
http://msdn.microsoft.com/en-us/library/bb862071.aspx
A thing, you should have a look at, is the language dependant syntax in the formulas, f.e. on a german SP Server you have to use the “;” semicolon as a seperator in your formula, but on an english server a comma “,”. This is not mentioned in the msdn.
If you think of I18N and Solution Deployment, this is really a thing, microsoft should standardize.
