While we were promoting our directory, we came across several directory lists
which show the top ranking directories out there.
Here are some:
ILQ-based directory ranking:
http://www.seocompany.ca/directory/top-web-directories.html
The ranking is based on ILQ (Inbound Link Quality), which is supposed to capture the quality of inbound links from yahoo, dmoz, edu and gov sites. They assign different weights for inbound links from yahoo (1), dmoz (30), edu (45) and gov (67), and then do the weighted sums of all the inbound links. There is some controversy whether we should consider backlinks from edu and gov much more authoritative than others. For example, one can easily obtain backlinks from personal homepages hosted at edu sites.
Seomoz’s page strengh based directory ranking:
http://www.avivadirectory.com/strongest-directories/
The ranking criteria include a mix of backlink counts/quality, traffic-level, pagerank, domain age, search engine ranking, etc. Combining such multi-dimensional data to calculate meaningful “page strength” is by no means easy. Apparently the page strength result shown are rather sensitive to tweaking factors. Also, some of the factors being used are not a good indicator for page strength. For example, Alexa ranking and domain age may assign unwaranted high strength for those sites hosted at popular web sites as their subdomains (e.g., blogspot.com). Although their attempt to come up with an “unbiased” metric for measuring the importance of a web site is well-received, there seems to be room for improvement.
