If you're running Mac OS X 10.4 and you're seeing the processes
LAServer taking all of your CPU, it's probably because you're putting a lot of new data onto your disk somehow. Spotlight is indexing -- LAServer is the language analysis server, mds is, I think, the "metadata server". More grokkage if you man mdcheckschema, mdfind, mdutil, or mdimport.
If you don't want the new files indexed, go to System Preferences, Spotlight, and add the folder(s) that you don't want indexed in the Privacy tab. The UI there is a little sketchy in that it adds the file asynchronously -- good from a UI responsiveness perspective, but the final implementation leaves you wondering whether or not the folder actually got added.