Web 2.0 Technology
How to Write a Portlet
Portlets development resources
Jetspeed - Jetspeed Portlet Catalog
Viador Portlets - the key components of many Viador E-Portal solutions.
The GridSphere portal framework provides an open-source portlet based Web portal.
IBM WebSphere Portal Server - What is Portlet
Divine - portal drivers solutions
Portlet Builder Accelerate, Simplify and Delegate Portal Deployment
Portlet application programming
Developing Portlets - WebLogic Personalization Server
SiteScape Portlet for Oracle9i Application Server
Coding your first portlet for Pepo
Portal Star Solutions - BEA WebLogic Portal
Verity K2 Search Portlet for BEA
divine Search and Content Integration (dSCI) portlets can help users work even more efficiently on Oracle 9i application server
Gate5's product portfolio includes a set of application modules (portlets) that are available for multiple devices/access channels - web, WAP, SMS, PDAs and Java-enabled smart phones.