I have a later revision of the 12" PB G4 and I am noticing that he is slowing in his relatively old age. I love this little guy and don't want to get rid of him. What can I do HW-wise to keep him bumping along? Still has the stock 60G HDD that I've considered replacing, already added 1G of RAM. Should I have Apple switch the HDD? Can I do any possible changes myself?