As an online business development professional, I find Google's reindexing of web pages on a daily basis rather confusing. Yahoo is far easier to understand and maintain a ranking than Google.
When analysing top positioned web pages, keyword density, links etc. the results vary dramatically. Some no. 1 sites on a single word search have no text, no meta tags, low keyword density and so on.
My question is: Does PageRank matter anymore and does Google reindex on a daily basis rather than a monthly? And if so, what actually carries the greatest weight within Google's search engine algorithm?