I use the IdeaPad now for 4 days and I'm still happy with it. It was sold with Suse Linux Enterprise Desktop, so most of the hardware works out of the box in Debian Lenny.
Wireless (BCM4312)
I had to fight with the wireless card, it only works with the closed-source driver from the broadcom website. And as all closed-source drivers suck, this one does too: I have to wait a few minutes to turn on the wireless network after a reboot, or my kernel will PANIC. - Yes! Great! I can live with that for a while, as I don't have to reboot very often: suspend2ram works perfectly.
Touchpad (Synaptics)
The touchpad is twice as wide as high, but it seems it doesn't know that, because it is twice as fast on the vertical-axis as on the horizontal-axis. This feels very strange. Why didn't they just use a TrackPoint...?
Soundcard (snd-intel-hda)
The sound itself is good and works out of the box. I still haven't found out how to use the microphone, I can't set it as the capure-device. If I can't find it out myself, I have to write the SLED-image back (of course I made a backup before installing Debian!), and look what they have done to get it to work.
Update: I installed the most recent ALSA-drivers (1.0.18a), and now it works.