This is one of the best bookmark managers available in my opinion. I have tried manually managing my bookmarks, using some of the free stuff, etc. I have tried Filemaker DB's, but always they were to limited, to cumbersome, to limited or lacked some of the features I desired. This produce has almost all that I want or need. It also has things that I didn't know I wanted or needed and things that I probably will never use. Warning: If you only keep a few dozen to 50 - 100 or so bookmarks, you do not need this product. This product is for those of us who have accumulated hundreds or thousands of bookmarks and are anal enough to want to keep them validated and organized. For us, this product "worth its weight in gold."
It now integrates with the two most popular Mac browsers, IE, and Safari, along with Mail and Entourage. It also works with many other browsers and mail programs. It sorts, organizers, libraries, indexes, validates, edits, and maintains bookmarks. It also does it easier and faster than most of the browsers and allows you to use a single set of bookmarks among multiple browsers.
This is a product you do want to read the instructions on so that you don't miss out on the many features of it. It is loaded. You can use it without the manual but you will be "kicking yourself" for what you missed later.
Support is good. Betas are not announced as the developer treats betas as true trial software. So if you want to try out new interim releases, you need to check MacUpdate or the website.
A Bookmark librarian is a difficult product to write since everyone has their own idea what it should do, what features it should have, and how it should work. It also has to be compatible with a number of different products, given the variety of browsers in the marketplace. While not perfect, I believe URL Manager Pro is the standout product in its category.