Filing Single or Jointly

It is tax time again, and people are looking for help with taxes already since the first day to file your 2008 taxes is nearly here.  I'm not sure of the exact date since I probably won't file to April but I do know it is around the middle of Jan.

Today I want to highlight a few tax questions

How many dependents can I claim on my taxes?

Can two people claim head of the household?

Is it better to file single or married jointly?

Where can I retrieve a copy of my w-2 from?