ibdata1 and *.ibd. Do I need both?

[Nathan Gross]

Hi;
A while ago, I changed most of my myisam based tables over to innodb. Fine.
A while later, I noticed and implemented the option to keep the files separate.
Now, weeks later, I still have a huge, 7 gig ibdata1, plus many *.ibd files.
Can I delete ibdata1? What worries me is that when I have new inserts
into the db, the os timestamp of ibdata1 is in-sync (fresh) with the
ibd files.
Please advise.
Thanks;
-nat