My phone thinks I'm a geek

Predictive text is great, but a double edged sword. I've taught it a few too many acronyms, and now they are the default. These defaults for common words are really annoying:

I type My phone shows
see pdf
to vm
the uie
for dns

So, "Go to the office and see john" becomes:

Text message showing "Go vm uie office and pdf john"

Are there any others who've been unstuck by this, or am I the only one?

Also, is there a way to change the dictionary? I've seen reports of it being in: c:\system\data\predic\10xxxxx.dat, but I don't have that folder, at least browsing via bluetooth.