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I personally use 4-space tabs. I actually hit the <TAB> button to indent, not the space bar.
When Petruchio originally made this poll, I figured that it was asking for your tabstop preference. It just didn't make any sense to me that people would indent with spaces, when tab takes many fewer keystrokes. I know that I wasn't alone in voting for "Four spaces" when my tabstop is 4. A bunch of other people in the IRC channel did the same thing.
For those of you confused, here is a quick VOTING-HOWTO on this poll
1. Are tabs syntactically-important in your language? If so, vote for Python.
2. No indentation? Vote for none.
3. To indent, do you hit the TAB key? If so, vote for Tabs.
4. If you use the space bar (bad choice!), vote for the appropiate number of spaces.
perl -e 's ssfhjok qupyrqs&&tr sfjkohpyuqrspitnrapj"hs&&eval&&s&&&'