The Groke
hot hail/Paging Dr. Beat
I really should take some time to read up on maintainance measures I should be doing on my macs. I keep meaning to verify permissions and discs but keep forgetting.
OS X runs maintenance routines if left to it's own devices - including things like repairing permissions.
I leave my laptop on overnight usually in order to allow these scheduled things to run in their own time as they generally happen at odd times and/or when the machine is idling.
If you don't want to do this, then download Onyx (free) a very good little app which allows you to manually run the various clean up and maintenance tasks built into the Mac - all in one hit should you so desire.
Is Little Snitch worth it?
Little Snitch is ace - once installed it is amazing just how many apps and services make contact with the internet and how often they do so - usually for perfectly innocent reasons.
However, there is malware out there which may potentially mine data from your machine or "phone home" to someone with information you wouldn't want them to have.
Again on a Mac, this is currently not as likely to happen as on an unprotected PC, but still...
However, bear in mind that if you use *ahem* evaluation copies of software acquired online, these too can "phone home" to the vendors, potentially informing them as to your illicit use of their product.
Little Snitch lets you nix all of this very easily and only allow things you want through onto the web.

)
*hopes the internets police aren't reading*