Most likely no, it is not possible. If you remove the laptop keyboard from the laptop you will notice the connector ribbon. You would need to find an external keyboard that took this type of connection or you'd need to find an adapter (as pointed out in @billc.cn comment) that would convert the proprietary adapter to a standard USB/PS2 keyboard adapter. Ultimately, if you managed to do that, you'd have to custom make a container for the keyboard so that it sat properly and ergonomically for usage.
If you want to do it as a side-project and invest time and money to learn and solder and reasearch, it's definitely a possibility, but for practice, no it's not.
2Possible? Yes. Practicable? No. – Nifle – 2012-02-04T12:24:44.683
4To extend on Nifile's answer: laptop keyboards use properiatery connectors and to connect them to another computer, you need a adapter, probably custome made. The cost of making that adapter is probably equivalent to that of several good keyboards. – billc.cn – 2012-02-04T12:37:37.660
1If it's a reasonably new unit of popular design and in halfway decent condition you can probably sell it for spare parts. There's a strong market for displays in particular. – Daniel R Hicks – 2012-02-04T14:08:02.263