Hi,
I had problems getting my MiniBook to connect to the office wireless network using WPA (via a Belkin F5D7130 wireless access point), but no problem at home using a later Belkin F5D7132 access point (although it took much longer to pick up an IP address).
I had to set security to WEP at the office location, but improved security by allowing only authorised computers to attach to the network by using the "MAC Address Control" security feature present on the access point web admin page - the MAC address of the MiniBook is NOT the one printed on a sticker on the base of the unit, which I assume is the address of the wired network socket, but the address of the WiFi port (which can be found by connecting to a wireless network and then opening a terminal window, logging in as "root" and typing "ifconfig" (look for the numbers after the word "HWaddr"))
The above blocks connections by any computers which are not in the "allowed" MAC address list - I think many wireless routers and access points/repeaters also have the MAC address control feature. Of course I had to find the MAC addresses for the other computers on the network and add them to the "allowed" list too.
Hope this helps.