Heating.

I'm not certain what you mean by "Bitcoin hashing power".

Right now, the majority of bitcoin hashing power is supplied by ASIC.

In the past bitcoin hashing power was supplied by GPU chips, and before that it was supplied by CPU chips.

CPU chips and GPU chips have MANY other uses now that they aren't very useful for mining any longer.

If you are asking about ASIC, then you need to understand that ASIC is an acronym for Application Specific Integrated Chip

You should probably go learn what the word "specific" means if you are asking what else it can be used for.

"complex" is a relative term.  Many people find that anything beyond A+B is "complex".

I think there there will soon be a considerable amount of money to be made by someone who designs a service/system or what have you that is specifically meant to be used with ASICs that no longer make sense to mine with.

Could block erupters be used to encrypt decrypt VOIP SMS data somehow in a way that is meaningful?

I need to read more about this...

Do you see now how the things you are saying don't make a lot of sense?

Microwave ovens can be used to destroy optical media very quickly. hehehe. Try it for about 2 seconds on a busted CD DVD.

If its an FPGA, it might also be good for:

- creating rainbow tables (pre-bruteforcing)
- monte-carlo-simulations
- some other bruteforcing stuff =)
 
If its an ASIC, as my pre-posters already mentioned, its mainly producting heat. And its not only SHA256, its SHA256 twice

No, address generation uses completely different algorithms than what is used for mining.

Back on-topic. Can the ASIC chip be removed from an ASIC-based bitcoin minor and be replaced with another ASIC chip to perform a different task.

It does because i² is -1, and amazingly it works the other way around too, so 2ⁱ is also -1. e is just 2 with some extra digits which we can ignore since we're dealing with integers here, so eⁱ is -1 as well. And of course, π is an odd number, so -1 raised to the power of π is still -1. Ergo, e^iπ = -1. Q.E.D.