A couple of suggestions in the comments thread at the site.

A motorbike seems to get the majority vote

That’s one of those whatchamacallits. They are easy to spot. Do you see
on the one end it has a thingamabob that easily attaches to a dohickey.
Also, the clincher for me is that the whole thing is wrapped in one of
those gismo’s

I second what youknowwho said

I think you're both right. I thought at first it was a watchamacallit on circle thingies for sure and the other one a big bottle wrapped in duct tape so I'm probably definitely wrong.

maybe the answer to what this is, is much less complex; here's another blog post with another photo - more zoom on the object: http://2ndwave.blogspot.com/2008/03/can-anyone-indentify-this-object.html

I'm not sure how much it weighs, but if it fell from the sky, the impact should have caused a crater of some sort? Or the object should have broken to pieces on impact?

my best guess - dinosaur egg

could it be a weather balloon of some sort?: http://updatecenter.britannica.com/art?assemblyId=90645&type=A

http://www.cartoonstock.com/lowres/bgr0029l.jpg

I told dad he didn't need that whole can of lighter fluid to light his new gas grill.

n2sooners your comment reminded of a sinister-looking grill I saw the other day:
http://www.pantherhouse.com/newshelton/wp-content/uploads/2007/08/bbq.jpg

Under the article is says:

Update: We seem to have a winner. It looks very much like a fuel tank, called a composite overwrap pressure vessel. Robin Titus in the comments was the first to specify, for the record. He wins nothing.

@ My hat, Alan, you're a mine of interesting images. Thanks sweetie.

He wins nothing LOL!

michelle, I've saved and bookmarked so many images that my hard drive is almost full-up!!!

That's my grandfathers tempest levitation valve!

Was Stephen King seen poking around it and is he growing grass out of his skin yet?

Pop and another pop for alan's grill.

hahaha, a motorbike would have been my guess to, its quite obvious its standing right next to the watchamacallit or was that a thingymajig, OH i forget these common household objects names