Domain Social Forums

i have several domain names and have no clue of the value of any of them... i dont want a paid appraisal just the advice of experienced domainers.

they are as follows ( with possible markets);

- http://www.sexysilk.co.uk (lingerie, fetish)
-www.motorworkz.co.uk (for all things mechanical, ie cars, motorcycles)
- http://www.upyourgains.com (either financial gains or physical gains)
- http://www.upyourgains.co.uk (as above)

I am completely new to this and any advice, appraisals, traffic boosting tips would be appreciated. Pm me or e-mail Compin_yeo@hotmail.co.uk

Thanks