Sync2It's BookmarkSync for Mac OS X

Sync2It is a real-time automatic synchronization service that allows you to access your bookmarks, favorites and favorite files from any computer or any browser, without changing the way you use the Internet.

Keep bookmarks in sync across your different computers and operating systems.
Use with Windows 95/98/NT/2K/ME/XP and MacOS.
No manual importing or exporting required!
Keep your Netscape bookmarks and Internet Explorer favorites, your work and home links in sync.
Share your bookmarks with friends, family, or school district.
Search and browse the internet's best sites, hand-picked by other Sync2It users.
Includes a comprehensive, full-featured bookmark manager utility.
Effortlessly upgrade your new computer's favorites!