Despite the content being no longer availabe online, it is normal that it still appears on searches. Google's search engine is not constantly scanning specific websites; even if it scans the website and doesn't find information, it will take several scans for the engine to mark it as invalid.
However, if you want to speed up this process, please access https://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=1050724 on google's website.