Best way to put them to work is start yourself a life tips blog, using that as the parking page. Put an ad or two on it, but not a whole lot- better to have volume of traffic than up front cash in pocket.
People seem to like the "Life's answers" type placeholder sites, that'd get the stats of them up so they are worth more to prospect buyers.
you have nice domains. You should develop them if you have time
If domain name do not have any traffic I do not think that is wasted domain name at all.Some of them are good names, maybe you could sell them for more than registration fee. Of course, developing a website for them should be more profitable, but I don't agree that quality website can be build in less than a week. And to get some traffic to it it WILL require effort. It is not that simple.
Well I am not sure I can afford to renew all of them. I have started selling buddhatree.com, net,info; buddiesearch.com,net,info,org
LEt's see if I am able to sell them