It allways better to hook commits on the server, because it is allways difficult to force users to do some settings in Tortoise SVN.

We only set hooks on the server and bugtraq properties (users will receive this properties during the update their local copies).

Sorry for typo. Again and better:

It's always better to hook commits on the server, because it can be difficult to force users to do set up hooks in Tortoise SVN manually. We only set hooks on the server and set the SVN bugtraq properties (users will receive them during the update of their local copies). It works for us.

This means that if i configure the hooks on the server, nothing needs to be done on the client's Tortoise SVN?

Yes, that is correct

So where on the Gemini Items screen are the commits done in SVN supposed to show up? N.B. I am using Gemini version 5.1

In the comments section.

I will try again with the hooks on the server side, and then update this question. One more thing, how do you set up hooks if the SVN server were running on Linux?

If you are running Linux then you need the TSVN one which will need to be installed on the client PCs (windows only).