A few weeks ago I decided to try estibot.com. I bought a 1 month membership for $19.95 and have been very happy with the domains I've found. I get excellent customer service too. Now there is a 1 day trial offered for only $1.
I've been using the Available Domains tool. If I wanted to search the word, example, I start with (example a), then (example b), etc. to get the most results. You may have to use example ba, example be, etc. depending on the number of results.
The tool gives you a list of available domains you can copy and paste into the Bulk Appraisal tool to get an idea of possible value. I ignore values under $200 unless it sounds commercially viable and is relatively short. You may have a higher or lower threshold.
Then I google the keywords in the domain with and without quotes to get the number of results and to see if or how many ads display. If the domain is ExampleExample.com, you'll search for "example example" and then for: example example.
Now, use the google adwords-keyword tool at
https://adwords.google.com/select/KeywordToolExternal. Put your keywords in quotes "example example". Set the Choose Columns To Display to: Show All. When the screen refreshes put 100 in the empty white box beside the recalculate button and hit recalculate.
This will give you the CPC (cost per click), advertiser competition, and search volume. Look at all the information you've collected and decide from there. What you register will depend on how you domain.
I park them right away. The domains I've found through estibot are getting traffic and clicks much faster. I got click revenue from VOIPperformance.com the next day.
Here is one: CreditCardSlip.com
estibot value is $530
google results with quotes: 36,900 and plenty of ads
google results without quotes: 561,000 and plenty of ads
avg CPC is $3.50, adv comp is average, and low to avg search volume
Maybe not everyone would have regged on those results, but I liked it enough to give it a chance.
I can't just look at a domain and judge the value like a lot of the Old Pros around here, but this method takes a lot of the stress out of "to reg or not to reg"

- for me anyway. I hope you all find some good ones which ever way you go!
Angela