In google, I know number of pages linked to your site will change every one month. How about the number of pages that indexed for your site?Why didn't you post this in the google forum? You will probably get more help there. Not to worry, Mods will move it.for me it changes almost daily. It really depends how often your site is spidered by the bots, this is really determined by how many links you have pointing at your site.The number of pages indexed for my site also changes every time it is spidered by Google.It does help if your pages are modified frequently ... Googlebot usually skips pages that are not changed since the last visit.