The AAC HD Lossless in Wavelab is an interesting format. It’s Lossless and Lossy. You can set the lossless layer for 24 Bit lossless, and the lossy layer for 256 kbps. Seems about the same size as FLAC. And it loads in iTunes with the ID3 metadata from Wavelab. I don’t really get how it works but it seems like an interesting idea. It’s slow to render in Wavelab right now (unless it’s fixed), but I think PG was going to look into that.