One desirable contribution are specific software (may be freeware,
shareware or demos). Others contributions like abstracts, papers,
charts, material from speeches, comments, and so on, are very welcome
too.
Send by e-mail your comments, contributions and suggestions:
E-mail by clicking here
For binary files contributions (like pictures, software, and so on)
there are alternatives to send the files, but nowadays I think the
simplest way is by using file attachment to e-mail.