Meyer lemons are fantastic, dontcry. They're a little "sweeter" than common lemons but also less acidic and they have a bit of a floral taste, so depending on what you're using them in, they can work better than regular ones. They also smell great. :-)
Ad-meyer-ation of its culinary virtues aside, this cultivar is likely a hybrid between a lemon and an "oranger" co-hybrid, perhaps an orange or a mandarin. To this marriage it owes its sweetness, perhaps.