A quick addition to the LaTeX Bundle -- there was some mention of "texdoc" on the TeX on OSX-Mailing list:
Command: "Lookup documentation of current word/package" Shell script: texdoc $TM_CURRENT_WORD (no input, no output) Scope: variable.parameter.name.package
with an addition to the language definition: (although I don't know if the scope names are valid TextMate-speak)
{ name = 'meta.label.package.latex'; begin = '(\(?:usepackage){)'; end = '(})'; patterns = ( { name = 'variable.parameter.name.package'; match = '[a-zA-Z,:0-9]+'; } ); },
This command will then open the corresponding help file for a selected package.
greets,
Dan