You know it’s slow in Aperture-land when the last two posts were software updates!
Aperture 3.4.3 appears to only address an issue I’d warrant most of us haven’t seen, since I haven’t seen any discussion of this in the forums. The only listed fix is “Addresses an issue that could cause a licensed copy of Aperture to prompt for a serial number with each launch”.
If you notice any undocumented changes, let us know in the comments. I can’t imagine this release not including other fixes, too!
Hit up the App Store (Software Update), or you can download a 550MB updater from here.