DeliciousSafari lets you conveniently use your del.icio.us bookmarks directly from Safari.

With DeliciousSafari + del.icio.us (a free service) you can:

• Easily keep your bookmarks synced between home and work.
• Tag auto-completion and suggestions when posting bookmarks.
• Apply multiple tags to a single bookmark. For example, if you tagged macupdate.com with “mac” and “software”, then later on you could find macupdate.com under either the “mac” or “software” folder.
• Find related bookmarks.
• Organize your favorite tags for fast access.