Chrome: If you're looking for a lightweight extension for easy Google Bookmarks searching, Lite Bookmarks is a lightning quick search tool and bookmarks manager.
Lite Bookmarks displays your labels and bookmarks from a simple address bar icon. There you can add bookmarks, hop directly into your Google Bookmarks account, and drill down through your bookmarks with instant-style search. Lite Bookmarks isn't the most feature-packed bookmarks manager around, but the search is among the snappiest. If you value quick indexing above all other features, it's worth a look.
For a Google Bookmarks manager with a wider feature set, check out previously reviewed Yet Another Bookmarks Extension. Have a bookmarks management solution you want to tell the world about? Let's hear about it in the comments.