USCIS had a press release in May that there is a Delay in H1B Visa 2013 Receipt Notices Dispatch. One should expect a delay of 60 days, but can vary due to huge number of petitions received by USCIS. I am not sure if you can do anything about this, other than waiting. Only the petitioner can approach USCIS with any queries and they asked you to wait.
However, if you could upgrade the petition to Premiun Processing you will get adjudication in 15 calendar days - check with your emploer on that option.