There are no mobile quad cores that have been released. The only way to put a quad-core in a laptop would be to use a desktop grade motherboard. Anyways all-in-all wed be talking a 15 pound bulky laptop. Nehalem architecture will likely bring mobile quads.
From Intel:
Dadi Perlmutter, Executive Vice President and General Manager of Intels Mobility Group, announced that Intel has launched its first mobile quad-core processors based on the companys 45nm Penryn architecture during his keynote.
The first processors will be the Core 2 Extreme QX9300 and Core 2 Quad Q9100 and will come clocked at 2.53GHz and 2.26GHz respectively. Both feature a 1,066MHz front side bus and 12MB of L2 cache.
From Tom's Hardware:
Intel is planning to launch its first quad-core CPU for notebooks, the Core 2 Extreme QX9300, in the third quarter this year with pricing set at a new high of $1,038 in thousand-unit tray quantities, according to sources at motherboard makers. With the market demand for top-level notebooks still below average, Intel expects the quad-core notebook CPUs will not become standard in the performance/mainstream notebook market until the second half of 2009, and therefore should not impact the desktop PC market, noted the sources.
Cheers,