I was one of the developers and primary maintainer for severals years 
for a TOC services at Cornell that was created about 5 years ago.  The 
UI is pretty dated but it still is used quite a bit although it does 
note produce an RSS feed.  It's only available to Cornell patrons 
because it's integrated with our catalog and ez-proxy system such that a 
patron can subscribe to a journal TOC, receive the TOC as an email 
message when it becomes available then click on any article int the TOC 
and withing 1-2 clicks see the full text of the article.

The user also has the option of viewing TOCs in multiple formats.  This 
is facilitated by taking the incoming TOC from the vendor, transforming 
it to XML, the applying a XSL style sheet to produce different formats 
including plain text, html, endnote, refworks, and a couple of others.