I restored few days ago, I didn't make iTunes restore, I asked it to create a new profile for my iPhone, synced my contacts, songs, videos, ringtones and Appstore.

all is working fine, I can play all music and videos, but when I go Settings -> General -> About. it shows that I have 0 songs and 0 videos.
Should I worry about this? is there something wrong with my installation or I can ignore it?

Ok after a reboot, the iPod (MobileMusicPlayer) kept saying "No Music". After long sshing... this what solved the issue for me:
1)untick all sync items
2)unplug iPhone and close iTunes.
3)ssh into the iPhone and go to /var/mobile/Media/iTunes_Control
I used the user 'mobile' since I'm working under mobile home directory and all premissions and owner of folders here should be mobile.
4)either remove or rename the folders 'Music' and 'iTunes'
5)create new 'Music' and 'iTunes' folders
6)open iTunes and plug in iPhone
7)tick all items you want to sync, then sync
8)reboot iPhone

this is what I did and it fixed the issue of "No Media" and the About window show the correct info now