In 2004 & 2005, Towel Day pictures were directly stored at the Kojv site. Due to storage space issues and with the advent of the forum later in 2005, all later Towel Day pictures viewable at the site were linked. If you are interested in viewing the 2004-2005 pictures, you can still see them on the Wayback Machine. Keep in mind that these pages load very slowly (probably glacially if you have dial-up).
2004 Towel Day pictures at kojv.net:http://web.archive.org/web/20080124045220/www.towelday.kojv.net/2004.html
2005 Towel Day pictures base page (with some pictures) at kojv.net:http://web.archive.org/web/20080111140218/www.towelday.kojv.net/2005.html
2005 Worldwide Towel Day pictures at kojv.net:http://web.archive.org/web/20080129075048/www.towelday.kojv.net/2005-worldwide.html
2005 European Towel Day pictures at kojv.net (many pictures on this page don't load at all):http://web.archive.org/web/20080211222319/www.towelday.kojv.net/2005-europe.html
You can also find kojv's front Towel Day page at:http://web.archive.org/web/20080124045234/http://www.towelday.kojv.net/index.html
Links are clickable, but some will result in a "Not in Archive" message. Sorry, I think all the forum threads are in this catagory.
Incidentally, the Wayback Machine (presumably named after Mr. Peabody's wayback machine on the The Rocky and Bullwinkle Show) is rather handy for finding things on the net which are no longer there - http://www.archive.org