UPDATE: For more information refer to this post on WpMayor.com

If you’re looking for a good guestbook for your WordPress blog, you cannot go wrong with DMSGuestbook.

Some of its features:

• Simple work on the attitudes over front-end (e.g. text color, guestbook width, border color…)
• Extended attitude possibility over the css file
• Preset DMSGuestbook caption text in different languages (e.g: german, english, swissgerman …)
• Every guestbook have his own language template (NEW in 1.15.0)
• Make your own language template in few minutes
• Set mandatory fields where user must be filled out
• Set text hidden in the DMSGuestbook (e.g. ip address)
• Captcha antispam (image, mathematically, NEW in 1.15.0 reCAPTCHA)
• Manage the DMSGuestbook user entries. (e.g. name, message, url, ip address)
• Sidebar widget
• Email notification when guestbook post was to submit
• Administrator can review posts before shown this
• Create your own guestbook template (beta)
• Administrator can search entries in guestbook
• Gravatar function
• Multiple guestbooks (NEW in 1.13.0)
• Define a selectbox and fill this with your own data (NEW in 1.14.0)