Upgrading a laptop with an Intel Core i7

[Cola]

Glad you like it. The older T61p can be flashed to a newer BIOS, allowing for up to a QX9300, but if you aren't going too extreme with it, the Q9000 is a decent quad core cpu for laptops of that age, otherwise have a look at the P9500, very capable dual core CPU clocked at 2.53GHz, also has lower power consumption by all of the T-series CPU's.

Other more powerful options are:
T9600, T9800, T9900, P9600, P9700, X9000, X9100, Q9100