I sometimes edit with CS4 on a Lenovo T61 – Dual core 2.09 GHz, 3 GB RAM, Nvideo Quadro NVS 140M. I edit everything from DV to RED, but it’s mostly simply stuff — it will choke pretty fast when you start getting multiple HD streams. Several things to improve the experience. If CS4 freezes or quits, try scaling back the graphics hardware acceleration. I turn it off completely when I’m editing. I have a 2nd internal hard drive for my video files, but that still isn’t fast enough for some things. I also have an external G-Tech RAID 0 drive with an eSATA card for HD files.