Moved from 10.5 to 10.6 on macbook Within the month - hard drive filled up and operation became probematic.. Replaced stock 160 GB drive with 320GB and added to 3GB RAM Installed 10.6 on new drive and transferred via Mac installer from old hard drive apps and data. Everything fine for a month or so. Two days ago email problems with warnings of low memory (wife reported) Yesterday went from 148GB to 85MB free space on hard drive Essentially the same problem that had existed before. What is up?