I found a cisco aironet 350 card and latest NOV28.2006 miboot image recoginzed it.
I successfully connected powerbook 5300cs to the wifi router with iwconfig/dhclient.
However, aironet card has errors on the interface (eth0)
It was possible to connect via ssh to local network computers, do wget of my provider's homepage, but not google, or some other pages.
Resolving works, wget, telnet to 80 port - not.
I wonder whether there is a necessary firmware installation?
Anyway, I decided to try newer kernel, 2.6.31, and it didnt boot:

Generic RTC Driver v1.07
Generic non-volatile memory driver v1.1
pmac_zilog: 0.6 (Benjamin Herrenschmidt <benh@kernel.crashing.org>)
Vector" 300 (Data Access) at [c3821e30]a Z85c30 ESCC - Serial port
pc: c002cb8c: hwreg_present+0xbc/0xe4
lr: c002cb10: hwreg_present+0x40/0xe4
sp: c3821ee0
msr: 1032
dar: 4
dsisr: 20000000
current = 0xc381c000
pid = 1, comm = swapper
enter ? for help
[c3821ee0] fffff000 (unreliable)
[c3821f00] c0586884 mac89x0_probe+0x1b8/0x3d4
[c3821f60] c0586248 probe_list2+0x4c/0xa0
[c3821f80] c0586318 net_olddevs_init+0x7c/0x11c
[c3821b0] c0003efc do_one_initcall+0x54/0x218
[c3821fe0] c055e1d8 kernel_init+0xb8/0x12c
[c3821ff0] c0014670 kernel_threa0x4c/0x68
mon> (here are blinking marker)
pcnet32.c:v1.35 21.Apr.2008 tsbogend@alpha.franken.de
Unable to handle kernel paging request for data at address 0x00000004
Faulting instruction address: 0xc002cb8c