I have a site related to photo hosting. It is indexed by google. Lots of link building have been done for this site. But google is not chaching this site. Last cache was on 4 aug. What may be the problem. http://www.photodekho.com
I am no expert but there is difference between crawling and indexing i think If the page is indexed then it gets into cache unless it is not said to do so via metatags,robots.txt If the page is crawled it will appear in the SERP but no caching is done .. There will always be a delay between crawling and indexing ... crawling comes first and then indexing .. so nothing to worry about if you ask me .. Just sign up in G Webmaster Tools and see whether you have any problem there