I can confirm this behaviour on both my laptop and my work PC. 
My PC has 2GB RAM and I have configured a 4GB swap partition. With KDE 4.2, 
compositing turned off and only a firefox tab htop says 2.7GB of swap are used. 
That cannot be normal. My RAM is only at 450MB (excluding cached memory).

This  is the output of free:
             total       used       free     shared    buffers     cached
Mem:       2051528    1763172     288356          0      12576    1290156
-/+ buffers/cache:     460440    1591088
Swap:      4257184    2774168    1483016

Swap usage is increasing only during normal use (I left the computer on
over the weekend and it stayed constant), but once at a value it never
decreases. Once the swap partition is full I experience an extremely
high hard disk activity, causing the system to become unresponsive.

** Attachment added: "htop-snapshot.png"
   http://launchpadlibrarian.net/26362208/htop-snapshot.png

-- 
High load average, disk read, no apparent reason - 2.6.28-11
https://bugs.launchpad.net/bugs/367377
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