Traffy is a very good Google Map of traffic conditions in Bangkok. Roads on the map are coloured green, yellow or red depending on the current traffic conditions.
Traffy can also provide driving directions. If users define a start point and destination Traffy will provide the best current route, avoiding where possible traffic jams. Traffy also includes map markers of traffic cams. When you click on a camera map marker an image of the current road conditions is shown in the map sidebar.
The EDT in EDTGuide stands for 'eat', 'drink' and 'travel' and this Google Maps mashup shows the best places to eat, drink and travel in Bangkok.
The site is a social sharing site so all the reviews of the bars, restaurants and other points of interest are provided by the site's members.
Both of these Google Maps come from the excellent Google Maps Fan in Thailand, which as well as providing reviews of Thai Google Maps mashups, includes tutorials in Thai on how to build your own Google Maps mashups.