I would like to know how many NBA games went OT for the season
2004-2005 and how many OT games this season (up to 28 Dec 05)

Hi tintinbright,

Here you go:

2004-2005 Season
October - 4
November - 17
December - 18
January - 11
February - 12
March - 11
April - 9
May - 4
June - 1

2005-2006 Season
October - 5
November - 18
December - 16

Source: 
NBA: Schedules
http://www.nba.com/schedules/


Happy Holidays!
Rainbow

It looks like this page of the NBA website will let you see which
games in the current season went into overtime:
http://www.nba.com/schedules/

And here is the 2004-2005 season:
http://www.nba.com/schedules/2004_2005_game_schedule/October.html#scheds

Happy?
Myoarin

Myoarin ...thanks for the info, good stuff, please post it as your
answer.  If you would kindly count the number of OT games, I'll rate
it a five-star.

Hey, glad you like the posting.  Since I am not a Researcher (those
with blue names) I can't post an answer, so you get a freebie, but
you've got to count to "OT" yourself.  I've only got ten fingers and
use them all to type here.  :)
Myoarin

Here you go:

2004-2005 Season
October - 4
November - 17
December - 18
January - 11
February - 12
March - 11
April - 9
May - 4
June - 1

2005-2006 Season
October - 5
November - 18
December - 16

Best wishes,
Rainbow

Great! I just love people around here :-) Rainbow, please post it as an answer