My website reaches 500+ visits daily from Google and also going great with SEO. Just few mins back I checked the info for my website at- http://www.google.com/search?q=info...s=org.mozilla:en-US:official&client=firefox-a but the cache of my home page is missing. Also when I type cache:bollymp3.co.in in the Google I get no results instead of opening the cache. What can be the problem because rest all is fine. I get traffic also my pages are instead at proper time.
Well it happens sometime...might be some update going on in Google's database. Keep working with your backlinks and submit a xml sitemap in Google by creating a google webmaster tools account.
Do not worry about the cache. Many times, I too see no cache for my sites. But after few days, the cache get back. Wait for few days, and hopefully you will see cache for your site.
Yep...Google does strange things with its cache. It is constantly moving webpages back and forth from its main index and its supplemental index. It is not something to worry about if you are still getting rankings and traffic. If you are concerned just keep getting more links and it should resolve itself.