I was able to clear that by cleaning the Cache under Settings > Applications > Manage Applications. Then, I would search for the keyboard input or something like that and clean the application data (sorry is these are not the correct terms, because I'm translating from Portuguese).
The problem is, I can't find that any more... Probably with the 2.1 update, they allow less aplications to be managed (specially, system applications...). Which is not that nice!
Edit: Found it!
If there, you select "Filter" and then choose "All" you'll see an application called "Default Input". Just clean the data and it should be fine! I'm pretty sure this was the option I've used...