One rather feisty (and—surprise!—Linux-savvy) Slashdot reader writes about his DRM discoveries in Windows 7. Along with complaints about seemingly big-software-friendly firewall access and registration DLLs, the author's chief discovery is that Windows 7 doesn't allow for any kind of software audio capture. In other words, if you've got one application playing sound, Windows 7 doesn't seem to allow you to use your same sound card to also grab the audio from that app.
Windows 7 testers, are you seeing similar findings? I don't trust my ThinkPad's built-in sound to be a reliable testing rig, so let us know if you're also blocked from in-system recording in the comments.