At the moment, Photohsop CS2 does not support video out, unless it is over firewire. You can plug in a dv deck/camera to the firewire port of your G5 and then hook the deck out to your NTSC monitor.
For after effects, you simply select the video out in the preferences, in your case, Kona 720×480 dv ntsc or 720×486.
If you want to use your NTSC monitor as an extended desktop, you download and install the kona control panel and click on the control tab. Set the default KOna output to Macintosh desktop. Then, click on the format tab and set your primary video format to 525i29.97. Click on the analog video out tab and make sure that the primary radio button is checked. Also, make sure that the analog component output of your Kona is connected the the analog input of your NTSC monitor.
Does this help?
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G5 Dual 2Ghz <> 4GB RAM <> FCP 5.04 <> Kona 2
ATTO 42XS <> Huge Systems 4105 Fibre
OS 10.4.2 <> QT 7.0.3