What are the SP 2010 certifications that are available? (I have both
dev and admin experience)
Where to take them?
How much are they?
How do potential employer can verify validity of my certificates?
Is there a genetic MCP or it's always on a subject?
How long are the exams?
What is the minimum score that you need to pass the test?
In answer to your questions, there are 4 exams to my knowledge, 2 admin 2 dev (i think) there is also the MOS exam which is an office based exam.
You take them at any Prometric exam site (check their website)
they are £88 each at the last check but if you book today (yes really) you will get a buy one get one free.
The MCP site lets people verify and you can create a profile to send them too.
min score is 70% for all exams I think or 700 out of 1000