These two Yahoo groups are good for stock market related discussions
related to EXCEL:

http://tech.groups.yahoo.com/group/xltraders/
http://finance.groups.yahoo.com/group/smf_addin/

The second group is mine. The files area has a free open-source add-
in, documentation on its functions, and sample templates showing usage
of those functions to retrieve data from the web. I initially wrote
the add-in because of issues I had with Web Queries in EXCEL --
specifically, that they almost always require using RELATIVE location
of the table because web designers don't name their tables. This
means any time an advertisement with a table is added or deleted from
the web page, the RELATIVE location of the table or tables you want
will change.