I bought Hog Bay Notebook and I really liked its successor Mori, but after several months under new ownership alas there is no significant new development and bugs are not fixed for months.
Now I started to look for alternatives and Together seems very promising. Don't overlook the Library Manager in Together, it gives you Mori's multi document feature back.
[Version 1.6.11]
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(2) 
ScrobblePod
Goldfive rated on 25 Jul 2011
[Version 0.7.1]
TunesArt
Goldfive rated on 12 Dec 2010
[Version 1.2]
+1
Mori
Now I started to look for alternatives and Together seems very promising. Don't overlook the Library Manager in Together, it gives you Mori's multi document feature back.