The only problem with an office suite on a small screen (Samsung Galaxy S) is the screen real estate, esp when using a virtual keyboard as opposed to a normal keyboard.
It is possible to do a document or two, but I prefer to use it for long, complex notes.
Just not worth it.
I got
ThinkFree Office installed on my Galaxy S. It is a great, amazing little Office suite. Have no idea how they crammed that into a phone... Seems to be a fully-licensed install...
By the by, do one get a pouch with built-in bluetooth keyboard for the Galaxy S?