I have three laptops here and they're actually in 1440x900; and this widescreen TFT here displays 1680x1050.. There isn't really a standard resolution.
At minimum, you can support aspect correction. If you wish to support the additional screen real estate, you can use a similar method and have an alternate version of all assets for a 16:10 ratio at the resolution you mentioned (or higher), and upscale as needed. In any case, if you're creating a casual game, be sure to detect and provide the best setting by default, without the player touching anything.