From Eli Robillard ...

UGS contains one of the nicest web part collections I've seen:

• Breadcrumbs - Fairly standard.
• Connected Page Viewer - More IFrame attributes than the Page Viewer, and works with connected web parts.
• Event Rollup - Aggregate calendars from subsites. Nifty!
• Flash Movie - Just what it says, clean implementation.
• Google Search - Displays results in-place, and can be configured to search a particular site.
• Google Translator
• Importable WebParts
• Outl2TccSyncer - Much potential, the goal is to synchronise Outlook and SharePoint calendars.
• Poll - Looks more like what you're used to than the built-in survey.
• QuickTime Movie - Just what it says, clean implementation.
• RateThisPage - Short and sweet, again more like what you're used to.
• Ressource Plan
• Site Navigation - Clean display, and many display options (from root, from child, etc.)
• TccFeeder
• TccRoleSyncer
• User Alerts - Lets an administer add, remove or change alerts for any site user. One way to push alerts rather than wait for users to subscribe.
• Welcome - Display personalised welcome messages.
• What's new - A concise list of New items on a team site.
• World Time - If your users work in different time zones, it helps to show clocks for each.

Download webparts and install instructions