Darren K.
Textedit can open Word documents, and so you may want to open it up in Textedit if you don't have Word and see how it looks. Pages generally does a good job of the conversion, but double checking never hurt.
If there are any formatting difference, another option is exporting the resume to PDF, and attaching that. The PDF will look almost identical to a copy printed from Word and be readable on most computers.
This help article from Pages 3.0 (and the article is similar in other versions) may be helpful:
http://docs.info.apple.com/article.html?path=Pages/3.0/en/c12pg9.html
Hope this helps,
Nathan C.