I just purchased a PDA from HP (the iPAQ 2215) which comes with a soft
called NEVo that allows you to use it as a Remote Control. However it
only brings a surprisingly short list of Favorite TV Channel Icons
(not even History Channel, CNN, etc). Somewhere on the web there
should be a document with all the best known channels' icons (they
should be in 24 bit bitmap form). In one of the forums I've visited a
user said "international logos are available on www.remotecentral.com
in the graphics section as 1 big zip file(all). Just unzip the folder
and paste all of them on to your favourate folder in nevo". However I
visited that site and could not find the file.
May question is: Where can I find a complete collection of
International Channels in 24 bitmap form? The the best Image aspect
ration would be Width 68, Height 42, but I can solve that if they come
in another size.
Thank you.

I believe that icons are available for most channels at:

http://www.mynevo.com/

You will need to sign up with a valid serial number, which should be
provided with the system.

I did sign up with a valid serial number at http://www.mynevo.com, but
as I said in the question: "NEVO only offers a surprisingly short list
of Favorite TV Channel Icons(not even History Channel, CNN, etc)" even
for registered users.

The remotecentral.com files are at this location:

  http://www.remotecentral.com/cgi-bin/files/rcfiles.cgi?area=pronto&db=other&br=designs&dv=networklogos&fc=&kw=&st=&dt=&so=&au=&le=&pg=4

See if any of the logo collections there fit your needs.

I found a collection of logos in PDF format here

  http://www.trademarks-logos.com/pdflib/televis.pdf

This may be useful if you (or someone else) can get them converted to
the proper bitmap type...

Unfortunately none of the collections you've recommended me have the
proper size/proportion or bitmap depth.
I'm starting to build my own collection by visiting each channel's web
site and making a Copy-paste of the logo into Photoshop, the I resize
it and I export it as 24 bitmap.

Thanks