There's a bundle of fixes to LCS 2005 SP1 that have recently been re-released which you can find
here. The docs have got a few bugs (like referring to the wrong filename of the download) so watch out... although these may have been fixed by the time you read this.
Also, if you're running Enterprise Edition and you have to run the installer on the SQL machine itself (which I thought was a bit bizzare, why not connect over ODBC like LCS) which the docs refer to as the "backend" server.
I've run it on two EE FE's and an EE BE at a client site and it worked without issues. One thing to watch though if you are running Symantec IM Manager you have to restart the service manually, the installer restarts the LCS ones for you.
Mike
Mike Jones
Technical Consultant - Compass Hill