Simple Visualforce List View Tab
You can create a custom tab in Salesforce that shows a subset of records in an enhanced list. No code needed!!
Let's say you have a subset of Accounts (e.g. partners) or Opps (e.g. projects) or Campaigns (e.g. events) and you want a separate tab where you can see only that filtered set.
Super easy - just create a new Page with an "enhanced list" component:
<apex:page title="NPower Consulting Projects" tabStyle="Opportunity" >
<apex:enhancedList id="eList" customizable="true" height="600" listid="00B50000005l8ab" / >
</apex:page>
Here is a link to the new Consulting Projects page I created in the NPower Seattle instance:
https://c.na3.visual.force.com/apex/projects
Only thing I would like to add -- although this might require a bit of apex coding -- is a way to filter those records further.