Updated to the latest version of libiptc, this fixes IPTC compatibility problems with Picasa and other software with faulty IPTC support (Picasa would sometimes skip IPTC data completely even if it was valid). Yes, you heard that Google fanboys.
IPTC data editing. Select images and press F9 (I didn’t have the time to draw an icon). Contact me if you need more fields in the editing dialog, I have no idea which fields are used the most.
You can enable IPTC keyword synchronizing in the configuration. This will modify the IPTC keywords every time you add or remove a tag for an image. This is experimental but seems to work OK.