Yes Dan. The Dual Channel DDR2 ram you're referring to means two LIKE sticks of DDR2 ram. Dual Channel is a configuration of your ram.
I better come back, and elate on that. To run two 'sticks' of ram in a Dual Channel configuration, the two sticks must be Alike. The same speed, ram timings, voltage, and chip configuration. This is why users just use two sticks of the same ram from the same manufacturer usually. They know the ram sticks are the same. (Your motherboard must also support Dual Channel configuration to run them in Dual Channel. The appropiate slots designated by the motherboard manufacturer also) When you run two LIKE sticks of ram in Dual Channel configuration, they 'piggyback' off of each other. It greatly speeds the ram processes up. If you just ran one of them, it would no longer be in Dual Channel configuration, therefore would not be running in Dual Channel. It just runs as one stick of ram. Let me show you an example of Dual Channel DDR2 ram. (You can find Dual Channel ram in DDR too!) Let's take this example of 2GB's of Ultra Dual Channel PC4200 ram,(DDR2 at 533MHz).
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1071042&CatId=2262
You see that it's listed as Dual Channel. Two LIKE sticks of 1GB. So you see, you can run a stick of DDR2, and another stick of DDR2 that's supposed to be Dual Channel. If the 'Dual Channel' stick isn't the same as the one that isn't stated as Dual Channel it will still run, if the parameters aren't too far off,(Parameters being speed, voltage, ram timings, etc. Heck, might run anyway! DDR2 is pretty 'forgiving') If you knew that the 'Dual Channel' stick was the same as the other one, you could see which slots to put them in, to run them as indeed Dual Channel. If they're in the right slots for Dual Channel as stated by the motherboard manufacturer, the BIOS on the motherboard will automatically set them to Dual Channel mode. Hope I've made some sense here to you. If it still sounds like a foreign language to you, email me.
Edit: Add-on info: http://en.wikipedia.org/wiki/Dual-channel_architecture