I use the word series because I was told that the BBC doesn't call the year's run of a specific show a season, they call it a series. As in "the series of episodes run in 2006".
Edit: I haven't seen any evidence of this on the wiki so I might have to stop.
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*NEW WHO started with Eccleston as the Doctor.
*end of Series 1 he goes away.
******Christmas Invasion
*Series 2 is the tongue-man David Tennant
*end of Series 2 Rose is ditched (yay!)
******Runaway Bride
*Series 3 introduces the brilliant Martha Jones
*end of Series 3 has the Master
******voyage of the Damned
*
*I thought (correctly)the Master was played by the main guy from Life on Mars.
*I was right! http://en.wikipedia.org/wiki/John_Simm
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End of Spoilers!