I don't have any overstays, but I do have the "7 day visa extension denied" stamp that immigration issues after you've already extended once. Jim Tachinamurthy
I replaced my passport in Laos in September. I have a Laos exit stamp (no Laos visa), a Thai visa exempt entry stamp, and a 30-day extension of that visa exempt entry.
I know it's too late now, but I'll write it in case any other group members don't know: Don't take a long-haul flight to Thailand if you have history of living in Thailand on tourist visas and visa exemptions.