Hi Namedropper. I am pretty sure there is no trademark. I have checked the online databases at USPTO, as well as databases in Canada, Australia, and UK.
Oh boy.
Look, if I:
1. Registered flippetywidgets.com in 1996, spent nine years selling "Flippety Widgets" shoes in stores and on my website, had an annual advertising budget of a million dollars, had radio and TV commercials in your area for my "Flippety Widgets" shoes, sold 200,000 units per year in stores in your state,
AND
2. if you came along in 2003, registered flipetywidgets.com for no particular reason, had it pointed to a ppc page that included "shoes",
THEN"
3. Do you think it is going to make a cup of warm spit's worth of difference whether I ever obtained a trademark registration in the US, Australia, or Canada?
Now, do you see all of those hypothetical facts? They each contribute in their own special way to how my hypothetical would turn out if you offered to sell the domain name to me for $50, $500, or $5000. It is a certainty that the facts in your situation are not "exactly like" the facts in 1 and 2 above.
If, for example, my domain name was instead "LargoShoes.com" and I sold a brand of shoes I called "Largo"; and if you registered "LargeShoes.com" to advertise "large shoes"; then the picture is radically different.