what is swapiness? and a few other questionss

so i was looking at the eclair rom thread at people's comments and i noticed that they were talking about how this swapiness thing made the rom faster. So what is swapiness and how can i set it?
I have a mytouch 32B with 1.33.2005 spl with 26I ending radio img. Amon Ra's 1.5.2 recovery image.

Oh and when i first rooted my mytouch i used the oneclick method and i realized that even with my earlier perfect spl 1.33.006 that i could flash roms. Later i decided to do the hard thing by making a goldcard to get rid of the perfect spl and i flashed the 1.33.2005 one. So what i want to know is what are the pros and cons of getting rid of my perfect spl. Did i waste all the time for nothing? and is my phone vulnerable to things that could affect my phone? and is it possible to revert to the "perfect" spl?

oh and people use these codename sort of things like Danger Spl and Hardspl and Haykuro Spl <<what are they?

sorry for all the noobish questions but i just wanted to know. thanks!

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