How i can bevel top edge for an drill like this http://sketchup.google.com/3dwarehouse/details?mid=c24cf584783ff76836f016fc66c4785.
I try'it roundCorners but leave a lot of empty surfaces.

@Gaieus
Thanks! Very powerfull tool. First, i have some trouble but when i find context menu, everything it's ok!
Thanks again!

Thanks!!!
My idea was to create a cross-section model and separate the two objects. Then move it to one of them.
Anyway your ideas are great but for a round object (like a rugby ball), I think the idea of ​​a section would work better.

I want to know what is the best technique to extend an object, without using scale tool.
Assuming that we have something like the following link. How can I change the length?
Scale tool can't be used because this tool obviously change and corners, and i don't wnat that.
http://sketchup.google.com/3dwarehouse/details?mid=37f2453b1e8332e2ad8f71736333a0

Thanks!
Seem to work. Yes, need to be scaled up but it's ok.
Thanks again!

How can round edge in this figure?
I try'it to upload to warehouse, but I can not pass goole conditions. I think it's a bug in Sketchup.
Anyway, i put an capture to be more clear about what i want.