I am curious about something. Is mining with no BIP100 or BIP101 designation counted as BIP100 or what? I mine with Slush, and do NOT use the BIP101 port. So who/what am I "voting" for? Is "abstaining" a vote for BIP100, BIP101, or neither?
Abstaining is a 'vote' for neither. It's a 'vote' for the status quo.
A 'vote' for BIP100 is also not technically a vote for anything at this time, as BIP100 has not yet been formalized and no code implementing anything is available - Jeff is working on that. It could be seen as "we want change, but BIP101 is not the change we want - BIP100 would have our preference in lieu of something else". The bitcoin-dev mailing list is probably the best place to keep an eye on BIP100 development.
Only BIP101 votes that adhere to the BIP101 mechanism (block version number change) are actual votes which - if there are enough miners and users supporting it - would result in an actual change.