There is a process called ES1000Server in my Activity Monitor today, I have never noticed it before.
The parent process is launchd. I’m using OS X 10.4.11.
I couldn’t find any info about it on Goojle or Altavista.
The only thing remotely Mac like in the search results is “ATI ES1000 video controller” but I have a GeForce 6600 in this Mac.