How many have you got in total - what's your hosting costs? thanks

Five or six.. Almost nil I have $12/yr. VPS and wrote a nodejs app to host them all off one port..

What sort of websites?

Blogs mostly, and ideas I come up with like http://codeht.ml although I don't put ads on all of em.

Would love any marketing ideas, as I don't know how to spread the word quickly and effectively.

That codeht.ml is a great idea and execution. Congrats.

Can you post a link from some of your blogs? thx :)

How do you monetize this codeht.ml ?

just from ads?

yea, adsense only

I used to do a few hundred a month from adsense on my tutorial site. Google penalties and lack of updates and now I only see a few dollars a month. My traffic went from ~70k uniques per month to 5-10k, so it's not that shocking that the earnings went down.

Sadly the spammy made for adsense sites I had did much better than the one legit site I poured most of my time into. I think this is part of the reason so much crap exists.