I've been looking at this for a week or so now, and I just have to post it. This is absolutely the most insanely great deal I have seen on notebook memory in a long time. For those with iBooks and/or 100MHz FSB Powerbooks, this may end up being a deal you can't pass up. Note that it is a lowprofile DIMM so it will definitely fit in the iBook. I love Macsales.com I bought my RAM from there a yr ago and in a month or so I will be getting a Firewire CDRW from them.