Creating Effective Poster Presentations is an excellent guide with many good examples of both effective posters…and posters that are not quite as good! There is a lot of great information at this site with many supporting examples
Designing Conference Posters : a site generated by a conference presenter. The site contains many design tips and also includes Powerpoint poster templates
Designing Scientific Posters : a site with design tips, poster examples and more powerpoint templates
The slides from the poster presentation may be found here.
Download Powerpoint Poster Templates with correct ECE artwork here.