My eldest son: "kee" (kitty). He was ten months old, which accounts for the poor pronunciation. :) He put two words together when he was a little over a year: When we'd turn the corner toward our house when we were in the car, he'd say, "uh uh ohm" (almost home). He said those things to anyone who was listening, I guess - which was usually me.
My younger son: "car" (clear as day, because he was about a year and half and, I guess, held off until he could pronounce clearly). He said it to me when he and I were looking out the l living room window; and a he spotted a car.
My daughter: "ta" ("thank you"). She was eight months, and I was amazed when she said "thank you" when I'd fix her hat strings or car-seat straps. At first I wasn't sure, but after a few times it was clear this was her way of trying to say "thank you". She said it to me.
She was a funny one, because she said nothing clearly until she was past a year old, but she had definite words for everything; so she talked regularly - but without pronouncing correctly (at all). With her brother's name (a hard-to-pronounce, three-syllable name) she'd say, "Huh huh huh" for a few months until she mastered the word. To call him the shortened version of his name (the shortened version has one syllable), she'd just say "huh". With her, because she made such an effort to regularly talk, I could see the process of her learning speech long before she put the final touch on it by suddenly starting to pronounce everything very clearly. At nine or ten months she'd say "nipt" for "milk", "damps" for "ants", "namee" for "blankie" (I don't quite know where that one came from. :) ).
(They're 35, 30, and 27 now. and have been very eloquent for quite some time. :) )