i have changed my site title for several days now, but its title is still not been updated, what should i do?

How many days have gone?

Google might take some time to re cache the website, it also very from site to site.

You have to wait. It may take a few weeks if your site is low in traffic and Pagerank. Higher Pagerank sites get indexed and updated faster then lower pagerank sites.

Wait, wait, wait, wait...I should have just said, "Be patient" but then again...Wait, did I mention...Check you pages for the correct data? Make sure that your meta tags are good, and also, if you didn't, be prepared to suffer from the search engines.

Google tends to be fairly aggressive about filling its cache, however, once it does cache something, it can be very slow to update the cache, especially if the page has few or no links and the web site has a low page rank.

One thing that might help speed it up though is to add new links to the page. For whatever reasons, that does seem to cause Google to update the cache of a page faster.

If you don’t have many links and don’t have a high page rank, it can take a month or two for Google to refresh its cache.

Trent Guidry

are you asking about the index or cache of your page? you just need to build links, to make it fast go to the site that bots are visiting more often.

Your old title and content are saved in Google cashed memory. You need to use nocash in your site so google index current text of your site not last cash for your site.

Try to submit your site on stumbleupon and you'll see that your new title will get index again in less than 24 hours.