linux:tools: how to edit pdf files

To the Linux Users who need to edit pdf files or figures:
In Linux, you may use pdfedit or xfig etc to edit pdf files, however, they are not good enough. For example, pdfedit is too slow to make users mad ( I am one of victims :-( ). However, you could use an online tool here:

http://www.pdfescape.com

to edit your pdf files. Fast, easy to use...