Normally the format of a URL in Google’s cache is:

http://google.com/search?q=cache:xxxxx:yyyyy

Where xxxxx is a hash of the URL and yyyyy is the address itself.

You can access the cache of specific URL by omitting the hash part and simply using the url:

http://google.com/search?q=cache:xxxxx

For example: http://google.com/search?q=cache:bbc.co.uk

This is also possible without editing the url, by simply searching google for “cache:bbc.co.uk”

To highlight terms within the cache’d page, add them on to the end of the search query, for example: Searching for “cache:bbc.co.uk sport” will highlight the word “sport”