In general when a scientific paper is published through one of the major publishing houses, the publishers require a transfer of copyright.  The terms transfer almost all rights to the publisher, but most of the agreements include a clause allowing the authors to share the work through their personal websites.

I don’t have the HTML page done yet (will have titles, abstracts, full papers and related links), but I do have the majority of my publications available for download.

I think that if any public funding was used for the research leading a particular paper, then that paper should be freely available to the public. ┬áThe publishers aren’t going to encourage this though, so authors of these papers should be sharing them as much as legally possible.