I tried Senuti when I got my iMac to do exactly what you want. When Senuti read my iPod, the album and artist were not listed in the columns. I did not like that.
What I ended up doing was moving my songs back into the iTunes folder on my PC, consolidating, saving off the library, and then replacing it on my iMac. I then reformatted my iPod from my iMac and sync'd it. Now when I run Senuti, all of my albums and artists are in there rightful column.
If you do a search on here, you should find out a link for step by step of how to do all of this. That's where I found it.