So i already went ahead and reserved the 3DS (could cancel and get my money back any time) but im still on the fence. The only reason im getting it really is because i don't want the value of my DSi to go down so dramatically after that $75 trade in promotion is over so i figured that i might as well get the 3DS now and take advantage of the $75 trade in since eventually I'm gonna get a 3DS trade in or no trade in. What are your thought on my decision? Any suggestions?

I keep all my consoles man, so I don't know what to tell you. I'm just gonna wait for the 3DS to go down in price, maybe build up its library with games I actually want to play.

I'm basically in the same boat as you. I'm going to trade in my DSi because I assume that, eventually, I'll want a 3DS, and I can deal with having the original design for a reduced price. I don't plan on picking up any launch titles and I still think it will be worth it. 
 
If you don't mind me adding it here, I had another question regarding trading in a DSi for a 3DS. I know that DSiWare is transferrable to the 3DS, but I can't find out how this is done. Do I just reconnect my account to the new system, or do I need to keep my old DSi until a service is announced to transfer over the DSiWare games?

I say cancel it. Yes your going to get $75 for your DSi but you still have to buy a $175 3DS and a game, I'm assuming you want to play games, so your over $200. The launch lineup sucks, except for Street Fighter which I already have a better version of it..., and in a year there might be a revision. Also, I know this is far fetched, what if this is a 360 scenario? A couple months from now we hear the batteries in 3DS's suck and only hold a 1 hour charge or something like that. I learned my lesson with the 360 the hard way so no matter how much I want a system, I really want the NGP at launch, I wait one year now for multiple reasons: 
1. Launch line ups suck for the most part.
2. The price will drop or a revision will come in a year.
3. You'll have a much wider catalogue of games to choose from.
4. In most Nintendo handhelds more colours will be introduced so wait for a wider selection.  
 
Plus take advantage of the upcoming DS clearance. DS games will still work in the future when you buy a 3DS and stores are probably going to mark down a lot of cool titles, like Professor Layton games etc. My local Best Buy is getting rid of their PSP stock because no one is buying them anymore so I might get games like Daxter and PaRappa for $5 each. 

I'm just hoping It's nothing stupid like "send in your DSi and we'll give you 25 digit code for each download". But it is Nintendo, and they can be ass backward about online stuff.

" @the_hiro_abides: Yeah remember the whole Other M fiasco. "Mail in your SD card for the patch..." dude come on we are in 2011.  "