Stephanie
after \begin{thebibliography}, insert \raggedright (actually, this is
rather trickier if you _are_ using bibtex to create your biblio).
(you can get a more satisfactory result using the facilities of the
ragged2e package rather than the built-in \raggedright.)
also, see http://www.tex.ac.uk/cgi-bin/texfaq2html?label=citeURL+setURL
--
Robin Fairbairns, Cambridge