Worked on my 700mhz IceBook recently. Since I got it both the trackpad and the optical drive didn't work. In the case of the optical drive I noticed that it wasn't even listed under System Profiler and it didn't even sound like it was powered on. I put off opening up the iBook, recalling my awful past experiences with opening up an IceBook. I knew the previous owner had opened up the iBook to remove the HDD, so I suspected that maybe the cable was loose.
Curiosity getting the better of me, I opened up the 700mhz iBook. I don't know if I've gotten used to working on these iBooks or what, but taking it apart wasn't as bad as the last time I worked on an iBook of this vintage. I only lost one screw this time! I ended up finding it after I had already given up and reassembled the iBook without it. Anyway, I discovered that the previous owner had left the IDE cable to the main board unplugged and that the trackpad cable was unplugged too. After plugging both cables back in and reassembling, both the trackpad and optical drive work now! It's nice not to have to daisy chain my external LaCie CD-RW drive to my OWC external SSD. I'm somewhat tempted to put an internal SSD in the iBook, but I'm afraid to press my luck when it comes to opening up these IceBooks.
I changed from a dual boot of Jaguar and OS 9 to a triple boot on my external SSD so that I now have Tiger, Jaguar, and OS 9 each on their own partition. It's nice having the internal optical drive working so I could use the DVD installer of Tiger instead of the CD version. I think Tiger runs better on here with 10.4.6 from the DVD as the base OS instead of 10.4.0 from the CD. I've been using Snow Leopard's Disk Utility on my MBP to make images of my OS 9 and OS X installs. I also used it to restore Jaguar and OS 9 from the DMGs I made after I was done installing and updating Tiger. I temporarily restored the Tiger Updates DMG from the Garden to the Jaguar partition since I experienced issues running the 10.4.11 combo update from my USB flash drive. Once I was finished updating Tiger i erased the Jaguar partition so I could put Jagaur on it. I can make images from and restore images to the SSD on Snow Leopard Disk Utility, but I can't erase partitions without getting errors, so all erasing and partitioning has to be done on the iBook itself.
I also discovered that Wolfenstein 3D will run in Classic on both Jaguar and Tiger, but the installer freezes halfway through. I had to install under OS 9 and then copy the Wolfenstein 3D folder over to my OS X installs to play the game under OS X.