First time poster. I'm experiencing very similar symptoms. The system
monitor shows my cached memory soaring to fill the entirety of my ram. I
can manually reset my cached ram with

sync; echo 3 > /proc/sys/vm/drop_caches

from the command line, which has about 75% effectiveness of putting off
the memory lag. The cached memory immediately begins to build up again,
and it seems to only happen when I'm file-sharing.

$ lsb_release -rd
Description:    Ubuntu 9.04
Release:        9.04

 uname -a
Linux kyler-laptop 2.6.28-15-generic #52-Ubuntu SMP Wed Sep 9 10:49:34 UTC 2009 
i686 GNU/Linux

lspci -vvnn
## relevant output only
08:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 5300 AGN 
[Shiloh] Network Connection [8086:4235]
        Subsystem: Intel Corporation Device [8086:1001]
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 2295
        Region 0: Memory at f2100000 (64-bit, non-prefetchable) [size=8K]
        Capabilities: <access denied>
        Kernel driver in use: iwlagn
        Kernel modules: iwlagn

-- 
Complete system freeze or instability in some wifi environments
https://bugs.launchpad.net/bugs/383332
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