I am looking for a video conferencing program that is H323 compliant,
works with ils servers, uses regular webcams (no custom hardware) and
supports full screen  video. It needs to run on either Windows or
OS-X. I have looked into a few and have had some limitations for each.
Netmeeting (doesnt do full screen). IChat (doesnt support ils or
regular webcams). xmeeting for osx (doesnt support full screen).
Gnomemeeting (doesnt run on windows/mac?).

Didnt get much information about other programs.. Cuseeme (is the s/w
still available outside of their service), IntelVideoPhone (is this
still supported?) etc

I need to find out the best video conferencing solutions given these
constraints. What they cost, whether they have trial downloads etc.


Thanks
-- AC

Have you checked out sightspeed?  http://www.sightspeed.com
Although you mentioned it needed to be H.323 compliant, and I'm not
sure it is, it is considered one of the best and most affordable video
conferencing solutions there are. 
http://www.sightspeed.com/about_us.php?page=press
I have tested it out and it is great.  It does full screen, uses
regular webcams, and pretty sure it can use usb audio also.  You can
also leave video messages if the person is not available.  It uses a
Instant Messaging interface and there is a generous free trial period.
 You can also contact the help desk, (via video if they are available)
to get your questions answered.  It uses its own servers to list the
people online but then after the users connect to each other, it
switches over to a direct peer-to-peer connection between the two
parties.  It also supports up to four different users conferencing at
once.  Make sure you adjust the bandwidth settings to get the most of
of it.  Check it out- nothing to lose.

To throw out another option, check out the Dlink DVC-1000.  It is
another very affordable solution which definitely uses H.323 for
communications.  http://reviews.cnet.com/D_Link_DVC_1000_i2eye/4505-6502_7-21043504.html
I got it from dell for $155.  I know you were looking for a desktop
solution but this will probably be where video conferencing in the
future- if it is going to go anywhere.  It utilizes your tv as the
monitor and can use a phone (corded/cordless) to communicate.  A
comprable product is the polycom V500 which goes for around $1,200 a
piece and the only main difference is not the codecs it uses for
compression but only the lens (CCD vs. CMOS, but dlink is upgrading
theirs soon).  The dlink also uses its own directory server.

Lastly, the cuseeme software is available here
http://clio.tucows.com/preview/193927.html

and other video conferencing software are here.
http://www.tucows.com/videoconferencing95_default.html

Good Luck.  Let me know if you have any questions.
mados