Big freeze and memory problems

Hello everyone
I'm pretty new in the wonderful world of ArchLinux. The installation was quite easy, thanks to the beginners guide and the wiki.
My laptop is a :
AMD Athlon Turion 64 1800 Mhz
ATI radeon xpress 200M
1024Mo RAM
So my system is currently like this :
Gnome + compiz-fusion
My ati is running with fglrx
Everything works fine except a "bizarre" thing with my memory.
When I start my computer :
top - 15:15:22 up 2 min, 1 user, load average: 0.64, 0.40, 0.16
Tasks: 104 total, 1 running, 103 sleeping, 0 stopped, 0 zombie
Cpu(s): 7.6%us, 6.3%sy, 0.0%ni, 85.4%id, 0.7%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 903920k total, 412252k used, 491668k free, 15900k buffers
Swap: 1164672k total, 0k used, 1164672k free, 148144k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3696 rydgel 20 0 10460 4472 3504 S 5.6 0.5 0:05.40 mpd
3697 rydgel 20 0 10324 3656 2728 S 3.3 0.4 0:03.44 mpd
3865 root 20 0 275m 86m 21m S 2.7 9.8 0:06.55 Xorg
4097 rydgel 20 0 38740 14m 10m S 1.3 1.7 0:00.43 gnome-terminal
4092 rydgel 20 0 19460 3956 3272 S 1.0 0.4 0:00.19 conky
28 root 15 -5 0 0 0 S 0.3 0.0 0:00.01 ata/0
3891 rydgel 20 0 5932 4412 1812 S 0.3 0.5 0:00.99 gconfd-2
3954 rydgel 20 0 84160 21m 14m S 0.3 2.4 0:00.77 nautilus
3966 rydgel 20 0 54932 13m 9.8m S 0.3 1.5 0:00.59 nm-applet
4072 rydgel 20 0 18144 8368 6732 S 0.3 0.9 0:00.15 emerald
1 root 20 0 1664 564 496 S 0.0 0.1 0:00.70 init
2 root 15 -5 0 0 0 S 0.0 0.0 0:00.02 kthreadd
3 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/0
4 root 15 -5 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/0
5 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/0
6 root 15 -5 0 0 0 S 0.0 0.0 0:00.01 events/0
7 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 khelper
And after a few minutes :
top - 16:47:47 up 59 min, 1 user, load average: 0.67, 1.58, 1.96
Tasks: 108 total, 2 running, 106 sleeping, 0 stopped, 0 zombie
Cpu(s): 13.7%us, 32.7%sy, 0.0%ni, 53.3%id, 0.3%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 903920k total, 893568k used, 10352k free, 85128k buffers
Swap: 1164672k total, 0k used, 1164672k free, 232032k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3862 root 20 0 314m 129m 32m S 19.6 14.7 7:53.44 Xorg
4183 rydgel 20 0 10456 4500 3508 S 14.3 0.5 5:07.84 mpd
4098 rydgel 20 0 242m 100m 27m R 14.0 11.4 9:35.00 firefox
4184 rydgel 20 0 10524 3996 2736 S 1.7 0.4 1:00.75 mpd
4061 rydgel 20 0 18124 13m 4616 S 0.3 1.5 0:23.53 compiz
4082 rydgel 20 0 20484 3988 3272 S 0.3 0.4 0:07.09 conky
1 root 20 0 1664 560 496 S 0.0 0.1 0:00.75 init
2 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/0
4 root 15 -5 0 0 0 S 0.0 0.0 0:00.06 ksoftirqd/0
5 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/0
6 root 15 -5 0 0 0 S 0.0 0.0 0:00.09 events/0
7 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 khelper
8 root 15 -5 0 0 0 S 0.0 0.0 0:00.05 kblockd/0
9 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kacpid
10 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kacpi_notify
11 root 15 -5 0 0 0 S 0.0 0.0 0:00.07 kseriod
So you can see that my free mem decreases dramaticly until it's 0 then .. FREEZE (about 8 s ) and after that 150Mb ~ free mem.
My memory grows when I do things like scrolling in firefox, watching video ..
And with my others distros I never saw something like that in the same configuration.
Maybe someone can help me

I've got similar problem. After 5-10 minutes of system uptime almost all my 900Mb of memory are used. Regardles of what DE I use (be it KDEmod3, KDEmod4, Gnome, XFCE, E17) - after 10 minutes of system works I have only 10-20 Mb free.
P.S. I do not use 3D graphical desktops.

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