List out Categories and Keywords

[Rob Wagner]

Does anyone have a snippet (preferably using render tags) that presents
Categories and Keywords on-page in a list format? I know I can do this in
ASP (the active templating language for this project), but the client would
prefer render tags if possible. Specifically, I'm looking to turn the
standard cat/key output of this:

"Cat1:KeywordA, Cat1:KeywordB, Cat1:KeywordC, Cat2:KeywordX, Cat2:KeywordY,
Cat3:KeywordZ"

Into something like this:

Cat 1
-- KeywordA
-- KeywordB
-- KeywordC

Cat2
-- KeywordX
-- KeywordY

Cat3
-- KeywordZ

Any thoughts or a pointer in the right direction are also welcome!

-rob