Since it launched in October, we've been pleasantly surprised by the nice ecosystem that has built up around Custom Search Engines. Here are some of the more interesting resources we've found outside Google that you might find useful. Happy V-Day from us to you!

Tools
Add CSE to browser (firefox and IE)

Importing del.icio.us bookmarks for CSE (aka Vik's tool)

Lijit: Personal Network Search


Lists
Finding Google Custom Search Engines

List Your Custom Search Indexes


Directories
CSE Links Directory

CustomSearchEngine.com - the directory of Google Custom Search Engines

Guide to Custom Search Engines

Workarounds
Using ASP.NET site with CSE

Google Custom Search Results Page on Your Wordpress with Adsense Deluxe

How to save search queries on Google Custom Search Engine

Google Co-op - An Intro & Some Insider Hacks