First time I noticed very fine flecks on the bottom of my oil drain pan after changing the oil in my zx10r, I freaked out a little. However, everyone told me it was typical and nothing to worry about. One benefit to changing your own oil all the time is that you can monitor for these things. Any sudden changes in how much, size, or how magnetic could be a warning sign.
'08 KTM 690 SMC -- Pure passion
'95 KTM LC4 620 RXC -- Parting out
'04 Kawasaki ZX-10r -- My lawyer loves it
"Hey, careful, man, there's a beverage here!" -- The Dude