Toshiba Satellite L505-S5990
Processor: Intel Core 2 Duo T6500 (2.10 GHz)
Memory: 2.8 GiB
Hard drive: 320 GB
Wireless card: Realtek RTL8192SE
Last time I checked, the wireless card isn't supported out of the box. The driver has to be compiled from source manually. It then suffers from the problem I've described for Ubuntu 10.10 and 11.04 below. Everything else seems to be okay, though.
Ubuntu 10.04.2, a revised version of 10.04, supports the wireless card out-of-the-box, but then runs into the same issues that 10.10 and 11.04 have with wireless Draft-N (802.11n).
Ubuntu 10.10 and 11.04:
The wireless card usually works, but when it comes to 802.11n routers, the connection can be frustratingly unstable. It tends to run slowly, and will randomly disconnect every now and then, often with increasing frequency as the session prolongs. Usually, it manages to reconnect after disconnecting, but in some cases, the only fix (without simply rebooting the computer) is to force-reload the driver by using modprobe. Other than that, I don't associate any problems I've had with the laptop itself.