Is there a PDF (or epub) reader that allows to take notes (or at least to copy text)? I have many PDFs that I would like to read on my Galaxy Tab and then take notes. Preferably the notes would be attached to the document (may be like Skim does), but as a workaround I can also imagine to copy a relevant piece of text into a separate note taking application.

Preferably the reader should handle PDFs directly, but if there is no PDF solution I might also start converting the documents (maybe with Calibre) for an epub reader.

I tried Adobe Reader, ThinkFree Office and Aldiko, all of which have acceptable performance loading the PDFs, but aside from cumbersome zooming they also lack the ability to copy or adding notes.
RepliGo Reader ($5) allows you to copy text and to make annotations.

Also, if you convert them to epubs the Nook app allows you to make notes.  It may let you copy text on a non-DRM'd book but I don't have any of those so I'm not able to test it.  (Just note that while the Nook lets you read PDFs the Nook app currently doesnt.