/var is getting full

[Graham Watkins]

Hi folks,

The other day when installing some updates, I got a warning message 
saying that /var was too full.

I checked using df and found it was 94% used.  (The partition is 
4.2Gb.)  This certainly seems a lot.  My 9.04 installation is just over 
a month old so I'm surprised it's got full so quickly.

What's the best (safest) way of slimming it down?

Cheers,

Graham