Robert,
Don't know if you already got resolution to the mis-spelled word removal for Android keyboard in Galaxy S. I had the same problem and joined this forum just to answer as it was driving me nuts (entered "convenienc" instead of "convenience" into dictionary which was very inconvenient). Samsung keyboard editable but no access to Android (which I agree is better).
SOLUTION (or at least the one I found):
*need rooted phone
*need root file manager
*need sql editor
Using file manager search for "dictionary"
Open the found dictionary folder for "android keyboard" and then the sub folder "words"
-you will be prompted to use "internal viewer" or" sql editor" to read the file
-uncheck the "do not show this again" box as you will want it to show again to get easy access to the sql editor market app.
-click "internal viewer" to check out the file contents. You should see a list of words and your problems should be easily seen. The problem is that you cannot do anything with them.
-go back and this time select "sql editor" and order it from Market. Pay the <$3 and download.
-repeat the same procedure from the search. This time you will use sql editor to open the "words" file
-if you select individual words by pressing and holding, you will get a menu, one of the options which is to "delete record". Do so. The mis-spelled word will be removed from the database.
-When you're done fixing things, exit out and reboot the phone to load the new database into the keyboard
-you should no longer see the mis-spells coming up anymore highlighted in red in the word selection bar (such as in email) as a correct word
Hope this helps