In reference to the patent: WO2008150815A2
Try the Public Pair search from the patent office. Search with this number: PCT/US08/65008
That number is the application number, and not the reference number (as you have given us in your question above). Data is listed from most recent to earilest.
06-06-2008 Notification of Intntl. Appl. Number and Intntl. Filing
This lets the applicant know that it has been assgined an Application number.
However, since the information trail stops here, so it looks like the patent in question is still regarded as a application and not a "patent".
06-06-2008 Notification Concerning Payment of Fees
This means: filer was asked to pay fees associated with filing the patent.
06-06-2008 Record Copy Mailed
A copy of the patent application was mailed to the applicant.
05-30-2008 Cleared by OIPE CSR
That means: Approved by Office of Initial Patent Examination Customer Service Representative
05-28-2008 Receipt Date
According to the patent office that means:
(a) Date of receipt and Priority Mail Express® date of deposit. Correspondence received in the Patent and Trademark Office is stamped with the date.
05-28-2008 IFW Scan & PACR Auto Security
Image File Wrapper -- an electronic version of a patent application.
Patent advisory committee representative automatically checked for problems. There were none and the process continued.
05-28-2008 Initial Exam Team nn
This means: patent application revived.
Alternately, and more simply, from the "A1" at the end you know it remains an application and has not been granted. "A" is called the "kind code" and tells you the status of the underlying patent.
See here, for a short page about WIPO kind codes: http://worldwide.espacenet.com/help?locale=en_EP&method=handleHelpTopic&topic=kindcodes
I actually think the USPTO has a better page (again referring to their use of WIPO kind codes) here: http://www.uspto.gov/learning-and-resources/support-centers/electronic-business-center/kind-codes-included-uspto-patent