If I am to submit my site to 100 directories, it is better to submit using different titles and description.....
yes, it is better to submit using different descriptions, as google will classify your site as being different according to other sites. sean
for just 100 its not compulsary, but if you do it then it would be best . Always remember to use multiple titles and descriptions while doing or choosing mass directory submissions, this way you are quite safe from google's sandbox effect.
Some people believe that you should used multiple titles for submissions and should use unique description for each submission. Some would submit only one title and description to thousands of directories.. I would say the best (value for time) way is to use multiple titles and descriptions and change descriptions every 100 submissions. If you have time.. I would advice using unique descriptions
Using different titles and description when submitting to a few thousand directories is obviously not possible. That's why I would suggest you to rotate titles, descriptions, etc. once every 50 directories.