I use Sound Studio to edit and track, and xAct for everything else. xAct can do batch renames, which was a huge time saver for me when I realized I didn't need to manually edit each file name.
It can also encode your FLACs (aligning on sector boundaries for those that still burn to CD), and tag your flacs. Let me know if you have any other specific questions and I can share my workflows.
Oh, one more thing, when you save .txt files on mac, save them as plain text. I believe it likes to use Rich Text by default, and that doesn't appear correctly on PC.
Good luck!
Jesse