Airport network issue/question

I'm sorry if the thread title is misleading, but what I WANT to do is to share files between a Powerbook and an iBook wirelessly.

Both 'Books have 'Personal File Sharing' enabled, and when I press Cmd-K on my PB, then browse, there are three shortcuts, 'Networks', 'Sam' (me), 'The Jorden's Computer' (the iBook). PERFECT.

On the iBook, using the same procedure, the the Networks available are 'Servers', then three folders, 'HOME', 'WORKGROUP', 'Local'. I cannot find 'Sam's Computer'! What am I doing wrong (I am not quick to criticize OS X)??

P.S. It did work on the iBook once, like 10 minutes ago, but now it will not... hmmm. Both are running 10.3.5.

Yeah, I've noticed after waking it from sleep it will work, but when I eject the 'Sam's Computer' network, it goes back to its problematic environment. Oh well... I (naiively) figrued the wireless networking speeds (file transfer speeds) would be about 54Mb/s. Where did I get that figure?? Lol, i was getting about .5Mb/s, making it hardly worthwhile to wirelessly share Da Ali G Show with my family.