If the answer to the question above is "No", be aware that you will not be able to install any future CU. August 2012 CU for SharePoint 2010 and later will only install on a server/farm which has SP1 installed.
June 2012 CU for SharePoint 2010 will be the last CU which installs on SharePoint 2010 if SP1 has not been installed.
Be aware that this also applies to Language Pack Service packs. So if you installed some SharePoint language packs you have to ensure to install SP1 for this language pack as well. If SP1 is missing for any language pack future CUs cannot be installed.