IGAUCHO  Crashes on startup for me in Leopard on two different Macs every time. Both were clean installs too. I guess it's not very Leopard compatible yet.  
(Version 1.4.1)

ALAN  still incompatible with leopard build 9a581  
(Version 1.4.1)

WILE E.  I tried a demo of this app and was pleased to get it with the MacUpdate Bundle recently. Easy to use, stable, and with a single click can save the page as a pdf, print it, present it in an e-mail, or take you back to the site. For my needs this is a perfect application done well although, arguably, a bit pricey.  
(Version 1.4)

DJINIBABY  bought it with the macupdate bundle, crashes all the time ... deleted and reinstalled, nothing helps, no support, NOTHING, very poor  
(Version 1.3.1)

HOWIEC  I hope you have a 10k RPM hard drive, lots of RAM, and a really pressing need to see a visual timeline of your websurfing, because otherwise this program is a big disappointment. It's slow, takes up a lot of space on your drive, and has a confusing UI. I could see this as a great tool for admins if it had some sort of VPN tools built in, because then you could visually monitor web surfing on a host of computers, and that would be useful for corporate and school IT departments. For the average user, however, I simply don't see the purpose. Just use your history menu!  
(Version 1.3.1)

SENTIENCE  As others have said, browseback is a good idea coupled with extremely poor execution. Performance is slow and stuttery, the full-screen UI routinely pops up when it is not wanted (like when attempting to use the Preferences window), the application provides no facility to hide the dock icon even though it is designed to run as a background service, and although the background color is adjustable, the color of the text displayed on that background is not.  
(Version 1.3.1)

ANDRAEL  Needs a "Flush all from History" or "Flush X period from history".   
(Version 1.3.1)

WANDERER  A great concept, many a time I remember the look of a site I want to go back to but can't remember the name, Browseback quickly finds it.

However, once the specified cache "limit" is reached the application dies!

Surely it can delete older files in the cache by itself? If you do it manually it works again.

Note: The files are kept in Documents/browseback.  
(Version 1.1)

ANONYMOUS  Very interesting concept but extremely flawed execution for the moment. This application is meant to be invoked via cmd-f12 but it shows up in the dock. When brought to the foreground the app frequently grinds for several seconds (on a dual 2.5 ghz) and scrubbing over the thumbnails is anything but smooth. You can't tab to get to the search box and the app freezes for a few seconds again when you hit x in the search box to remove the search term. In addition, it swiftly becomes a memory hog (After indexing my history it was at 434MB. I quit it and reopened and it was soon back to 230+).  
(Version 1.0b1)

ANONYMOUS  it is worth to know that (h)iStoryboard roughly does the same.  
(Version 1.0b1)

ANONYMOUS  browseback has a terrific non-windowed interface. The main paradigm is sliding over a deck of cards. It's very mac-like, but you won't find any Aqua windows or buttons. Mac-like like the Finder's eject button and Tiger's slideshow. The world need more interfaces like this.

That said, generating thousands of PDF's for thumbnails of browser history is a monumental waste of RAM and CPU time. Thumbnails should be tiny bitmaps, and only when printing a page should the PDF's be generated. At the very least, they can be generated in the background at low-priority and left on-disk and not in-RAM. It would also be nice to be able to save pages (or groups of pages) as HTML.

At $30, I would expect a little more features, like being able to specify sophisticated filters and perform operations in batch.

Didn't crash, but brought my computer to its knees.  
(Version 1.0b1)