Lion slowdown with excessive Disk IO

Right... First off... I was a happy camper. Then I paid for Lion. Now... Not so happy.
I have a 1 year old MBPro. 2.53GHz i5 with 8GB of RAM. Snow Leopard was OK. Not what I'd consider 100% sprightly, it had its issues (I'm not convinced of MacOS X's memory management), but this... This is just tragic.
First off. Clean boot. With 8GB of RAM I usually have about 6GB free. Start an app or two... What a chore. Menus are slow to drop down etc. CPU at about 2% utilisation. Still got 4-5GB free. And when using Chrome, or Safari, BANG! Spinning beachball
Running activity monitor in the background, I can see that when the beachball effect hits, I'm getting around 13MB/sec of sustained disk activity (Read). While this happens my laptop pauses... And then stodgily lurches into life again...
This is with nothing else running besides terminal, and mail... None of them consuming CPU or memory excessively (Currently, but that's a different story). Spotlight isn't indexing... (Unless it kicks in now & again and consumes all the disk IO just to annoy me)
Anyone got any ideas? Lion so far is being really painful for me on what should be a stonkingly fast laptop...
TIA
  Hamidh

Is it easy for you to reproduce? Would it help to log IO-activity? Open Terminal and type sudo fs_usage -w > ~/Desktop/usage.txt . Enter the admin/root password to start logging. This will write filesystem operations to a text file. Reproduce the beach ball and stop the logging (cmd-C i believe).
Analyzing the huge amount of output is a challenge, but because i think there is a relation with IO, this might help.
I'm still trying to analyze my situation. In the huge IO-log i have, i notice at one point in time, within 1 second, i see MANY entries, starting with something like getPPDVersion.<number>, followed by many entries with SoftwareUpdateCh.<another number> (every entry also says 'close' and every entry has 'F=x', where x starts at 3 and runs all the way up to 4863 (every entries states the IO only cosst 0.000001 sec). These are followed by more getPPDVersion.x entries. This is all within 1 second: 5.234 entries in that 1 second!
I see many entries from process 'kernel_task.427', but i understand this is OSX, so i guess it's ok? It's hard to find a clue to what might be the problem looking at that fs_usage log...

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    8   com.apple.MPEG2RADPlug         0x0000000122b55fe6 0x122b54000 + 8166
    9   com.apple.MPEG2RADPlug         0x0000000122b55d9f 0x122b54000 + 7583
    10  com.apple.proapps.MIO         0x000000010161db42 -[PluginLockPair volumeWithPath:error:] + 530
    11  com.apple.proapps.MIO         0x000000010161df54 -[PluginLockPair createVolumeForPath:error:] + 52
    12  com.apple.proapps.MIO         0x000000010161e3df -[PluginLockPair mountPath:] + 639
    13  com.apple.proapps.MIO         0x000000010161ec7c -[PluginLockPair scanPaths] + 332
    14  com.apple.Foundation           0x00007fff8d8a27fe -[NSThread main] + 68
    15  com.apple.Foundation           0x00007fff8d8a2776 __NSThread__main__ + 1575
    16  libsystem_c.dylib             0x00007fff8985b8bf _pthread_start + 335
    17  libsystem_c.dylib             0x00007fff8985eb75 thread_start + 13
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      rdi: 0x00000000ffffffff  rsi: 0x0000000000000000  rbp: 0x00000001231edc90  rsp: 0x00000001231edb10
       r8: 0x0000000000000000   r9: 0x0000000000000064  r10: 0x0000000000000001  r11: 0x0000000000000000
      r12: 0x0000000124a2d8b8  r13: 0x0000000124a2d870  r14: 0x0000000124a2d870  r15: 0x0000000000000001
      rip: 0x0000000122b5860d  rfl: 0x0000000000010246  cr2: 0x0000000114b6d000
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