I was flipping through Faiths and Pantheons trying to pick a deity for a character that I'm rolling up, and I learned that Namers (Clerics of Oghma) are told their Truename at a very young age, and I thought... Hey! That might be neat hook to make use of or expand my character in an interesting way. I know Truenaming is kinda bad, but if I just make it a secondary feature of my character it's fine, yeah?
...Then I went back to Tome of Magic, and was just... Disappointment doesn't really begin to describe it. Like, Word of Genesis is cool, and there's a few lower-level spells that are kinda nice, but pretty much nothing is justified by that failure state inherent to Truename magic: that damn Truespeak check.