As per the survey results that have just been posted:

Of the 1134 people took the survey, almost
85% of patients stated the cluster headache pain
was sharp in quality, while 45% stated it was also
pulsating, and 44% stated it could be pressure-like.
The predominant pain side was right-sided in 49%,
while 44% stated it was predominantly left-sided,
and this was a statistically significant difference
(P = .02). Bilateral cluster headache or experiencing
pain on both sides of the head during an attack
occurred in 3%. Pain would switch sides in 8%
during an individual cluster headache attack, while
31% stated that they had experienced some side
shift in between individual headaches or cycles. Pain
location was in a retro-orbital distribution in 88%,
upper teeth 44%, jaw 37%, ear 28%, and shoulder
region 16%.

And from the cluster survey I've been collecting data on since May 23, 1999 (12,026 responses):

Side of face affected Left side ONLY 4281 35% 
Right side ONLY 5295 44% 
Both sides 2310 19%

This is precisely one of the reasons I turned the poll function off a long time ago.  People were creating polls asking the same exact questions over and over and over.

If you read the article from Dr. Rozen and Royce Fishman, I promise you that most of these basic questions are answered there.