For help with words try the following websites:
http://dictionary.reference.com
http://thesaurus.reference.com
For fun help with grammar try:
Resources for creating posters:
http://www.ncsu.edu/project/posters/NewSite
http://www.people.eku.edu/ritchisong/posterpres.html
Resources for creating visual presentations:
http://michaelhyatt.com/slides/you-suck-at-powerpoint
http://www.readwriteweb.com/biz/2010/11/hate-powerpoint-here-are-5-web-based-alternatives.php
