I've heard many lay reports and shit about how "we were talking about blowjobs and then...". Okay how the hell do you get the subject onto blowjobs? I can get her to tell me about how she fingers herself but not about how she sucks dick. How do you do it? Anybody have any routines that can get the conversation headed in that direction?

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At the end of the day you need to ask yourself, am I a sheep or a wolf?

Umm... if she is comfortable talking about she fingers herself, than their is NO REASON, at least on the surface of things, about why she wouldn't be able to talk about blowjobs.
Before talking about how SHE specifically performs BJ or whatever, bring up some random fact about blowjobs. Something like 35% of women have never given a blowjob, what do you think? and let her expand.. when the conversation is flowing, you can directly ask her things about like, how many dicks she's sucked, what's the biggest dick she sucked, what's her fastest time in a getting a a guy off by sucking him, um...does she prefer giving head, or getting head(guy eats girl out is called head too, mind boggling i know).
All these question are open to discussion if you are already talking sexual. So don't be shy to use any of them.

Now, the only thing I can establish as to why she is not talking about blowjobs is from a few possibilities.
1) your not asking- Most likely
2) she's not good at it, therefor she stays away from the topic- Very possible
3) she's had a traumatic experience with blowjobs- Not likely, but still possible.

If you want better advice, tell me specifically how the conversations goes into her telling you how she fingers herself, how you try to bring up blow jobs, and in what ways does she ignore/not talk about.