Re: any good annatation software for reading math research papers?

In article <d8oa82$e8k$1@xxxxxxxxxxxxxxxxx>, kiki <lunaliu3@xxxxxxxxx>
wrote:

> Maybe this is a little off topic. I just want to share with you and ask you
> about the best software of annotating PDF files... Is there any good
> software of doing annotation in PDF files and then later can be searched
> (multiple PDFs) in an organized way?
>

Hmmm...yes, off topic, but you did put math into your subject line
somewhere.

Well, with Mac OS 10.4 you can annotate the pdf files and then use the
Spotlight search function to search all pdfs (including the
annotations). Not very helpful to people running a different operating
system.

Does anyone find annotating pdfs useful for math research purposes?
One drawback is that at least with paper you can draw little useful
figures or add details to a figure. Perhaps with search, annotated
pdfs would be useful enough. I still prefer to look at papers on well,
paper, though.
.