Like most, I have way more domains than I will ever develop. Some are good domains, registered many years ago. Some I still hope to develop, but I'm open to offers on all.

First off a couple domains good for geo caching websites. These domains would be good for sites marketing GPS devices, compasses and navigation equipment, rain gear, hiking equipment, etc. These domains have never been developed.

GOCACHING . ORG
GEOCACHEONLINE . COM

Next, some domains registered with the idea of doing some social blogging sites, one sort of a blog challenge site where users could vote up or down blog posts on other sites on similar topics and the other more of a grab opinions from other blogs and quote them type site, something I've found can be great for developing link pop (I've ranked top 3 with nothing but outbound links). Neither were ever developed:

BLOGAGAINSTBLOG . COM
BLOGGERDOZEN . COM

And some more:

BUY-CYCLE . NET - used to be active 11 years ago
BUY-ORTHO-EVRA . COM
COREMARKET . COM
DISCOUNTCONTACTLENSES . INFO
ENGINECORE . COM - used to be a marketplace for industrial engines and engine parts
ENGINE-REBUILT . COM
EQUIPMENTCORE . COM
F1-TRAVEL . NET
GENERICACTOS . COM
GENERICGALVUS . COM
PARKINGLOTWARRIOR . COM - was going to do a site selling tailgate party and school logo related stuff
REFIANCE . INFO - parked typo
RUGRATSANDRASCALS . COM - childrens clothes, toys, etc
RUGRATSNRASCALS . COM
SNAPPYNAPPY . CO . UK - we were planning on selling cloth nappies (diapers)
SUPERIORLENSES . COM - contact lens related
TAX-LAWYER . WS - high priced searches, maybe good for adsense
TRADEMARK-LAWYER . WS - see above
VIVEZBIEN . COM - planned on doing a site about living the good life with high end gifts, housewares, travel, food, etc

...and more. Feel free to ask if we have any on a specific topic.