As far as end user, did you mean those websites not using a parking page? A lot of the really good l-ll.coms and ll-l.coms are in parking as that's why the end user registered them.
Here are a few 4 character with dash websites.
b-et.com Business Enabled Technology
1-us.com internet service
g-et.com ecology website
bb-b.com cat photo album
ai-w.com chinese health site
m-gm.com 24 Times Corp
cc-c.com Berflin Coffee Shop
ci-a.com Asia Content Ltd
e-go.com Passlogix
x-xx.com phone calls
A2-z.com forum
aa-r.com architect
ba-r.com Barbara Anderson Realty
ic-e.com web design
c-me.com cyber merchants
m-me.com engineering
i-go.com pocket pc
2-it.com German company
ai-r.com Significant Solutions
a-sk.com Ask Consulting
b-to.com German Business
go-2.com mail server
