Get() returns whatever the thing contains. It's syntax is: classobject.object.get(start, end)
So, say you had a textbox defined as self.mytextbox. This code would check if the value of the box was "text". If so, it prints a notice to the command line.
if self.mytextbox.get(0.0,END) == "text":
_____print "The textbox says "text"
The 0.0 thing specifies where Get() starts searching - column and row (not sure witch is first), check in your python book. So, 0.0 specifies that it starts at row 0, column 0 (i.e. the start). END simply tells Get() to stop searching at wherever the thing ends, rather than at a specific point.
As for the sticky thing, I found this with a quick google search. From what I read, it simply specifies where the button goes if the grid is larger than the button (when there's loose space in the grid around it) - if it jumps to the top-left, or goes to the center, etc.
Not exactly sure though, as I gave up on getting grid() to work in the python activities and just ended up using place() instead. That's covered in the page as well.
Added (2009-08-14, 12:58 Pm)
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Oh, and I also found this, which shows how to stop people resizing the window. I haven't tested it yet, but further reading on google suggest that it disables the maximize button as well.
Might be useful for keeping the window nice and tidy.