When we Say SharePoint, we refer to two product of Microsoft (WSS and MOSS). On certifications front also, Microsoft has released 2 certifications each on SharePoint and WSS. One of the certification deals with the application development and others deal with the administration.
Below are the certification details
1. SharePoint Server 2007 ― Application Development certificationhttp://www.microsoft.com/learning/en/us/exams/70-542.mspx
2. Microsoft Office SharePoint Server 2007 – Configuration credentialhttp://www.microsoft.com/learning/en/us/exams/70-630.mspx
1. Microsoft Windows SharePoint Services 3.0 – Application Development certificationhttp://www.microsoft.com/learning/en/us/exams/70-541.mspx
2. MCTS: Windows SharePoint Services 3.0 – Configuration certificationhttp://www.microsoft.com/learning/en/us/exams/70-631.mspx