I did a couple searches but didn't turn up anything on this topic. Please point out a pertinent thread if I missed it.
I keep seeing events from Google Calendar which I've deleted that persist on the Calendar app on my Touch. I've tried re-syncing with no effect. I'm doing OTA syncing via Google Sync (http://www.google.com/support/mobile/bin/answer.py?hl=en&answer=138740) with overall success, except this persistent problem with items continuing to display after being deleted.
I do not see them in Google Calendars. I do not see them in iCal (2 different machines). I only see them in Calendar on the Touch.
Are you using POP3 or IMAP with Gmail? Do you have any other forwarding setup with your account? have you tried deleting/recreating your email account on your Touch with m.google.com to see if that changes anything?