I've experienced the same issue. It wasn't this way on my 1.1.4 so I think it might be something related to the 2.0 software update. I don't know how common it is but it is certainly noticeable and might be taken care of via an update.
YES! I made a thread about this in iPhone Software. I have this obsession with uncapitalizing my I's, and I have to wait for it to appear. That extra .25 seconds slows me down a lot, yes. lol =D It better be fixed in the next update or whatever.