www.freeprogrammingresources.com
Free Guestbooks
Guestbook Depot
Cut and paste the code into your page for a free remotely hosted guestbook.
Global Guest
You can change the title of the guestbook, change the blank white background with a wallpaper, change the lines in between the comments to actual rectangular pictures ie a row of beads or flowers and add midi music.
Bravenet
Bravenet offers a number of web services including free customizable guestbooks.
Pathfinder
Free customizable guestbooks.
eFreeGuestbooks
Fully customizable guestbooks for each user.