Check your web pages and website

Spell check the entire site.
Upload the site to the server and try it, checking all links and anchors.
Check images. Some may have loaded to a different folder and some sites may have changed address since your site was originally written.
View the site with images turned off. Ensure no essential navigation has been lost because GIF buttons do not display. Has the "<ALT>" tag been used effectively in the HTML to display captions where the image would have displayed.
Try the site with a text only browser. If you do not have access to one try http://www.cast.org/ for help.
Check how the site looks on other platforms. This is more of a problem but worth attempting to use different platforms.
Check the code for accessibility. http://www.cast.org/products/Bobby/ offer reports on the site of your choice.
Check the colour displays and graphics by setting your monitor to 256 colours. This should replicate the worst monitors and will give you an idea of whether your site is acceptable.
Check that the browser title bar matches the content of the web page.
Check the navigation and ensure there is more than one way to navigate from page to page within the site. Ensure that those links and icons are consistent.
Check the alignment of text and images on your pages are as you intended them to be and that images are of minimum size possible.
Check that any 'cool stuff' is justified and not merely gratuitous. Ensure there is contact information particularly should your users wish to comment on the site.
With acknowledgements to Waters, C (1997), Universal Web Design. Indianapolis, New Riders Publishing.