Change of targeted keywords? designs? what changes..?
I believe that page rank can't be measured by being indexed only.. page rank can rank high, or shall stay if you gather related links from your site regularly...
If you've changed your targeted keywords,, that can be one factor...
before you optimize on or off page,, you must think of your final targeted keywords and audiences.. what are your final services,, then after that,, you can go on the optimization...
well post on this thread again if you have more questions,, im sure many friends here in our community will help you..
