I got a dwarf tree because it would stay small enough to fit in a container without cramping the roots. I opted for the Meyer lemon because of its hardiness and its slightly sweeter taste (it's a cross between a lemon and an orange). But nothing prepared me for how much I would love smelling the citrus blossoms in the spring. They're lovely, and the yellow bursts of fruit perk me up whenever I take the time to notice them. Mine is only about a foot and a half high and produces around 10 lemons a season. I just make sure to give it some citrus food, make sure the soil drains well, and give it tons of sunlight.
(Image: Flickr user froglette licensed for use under Creative Commons)
(Re-edited from a post originally published on 3.27.2008 - CM)