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Is this truly the ideal wood to build a box out of? It seems awful heavy...I'm building a 2 cu.ft. box to go behind the seats in my truck, and from the way it looks, it's going to weigh about 80lbs(just a guestimate)...Should I stick with the 3/4"?

Also, could someone-preferably kiki-help me out with the porting? It's a 2cu.ft. box for my single 12" Kappa DVQ. I've never had to make my own ports before, so if you could...well completely walk me through it that'd be great!

Yes 3/4 inch mdf is the way to go. It may seem heavy, but you will need it for the pressure produced by a 12" sub. I have a 2.5 sq ft box for 2 12's and it is pretty heavy, but I don't think it is anywhere near 80lbs...
I think kiki will want you to look at a port box calculator that will help you design the correct port volume. Are you doing a slot port or a round port? If you haven't already check out winIsd. It is a great box-building program that you can download for free, and it includes a port calculator.

what kind of subs do you have? and what kind of truck? ive delt with plenty of truck style boxes... yes MDF is the best way to go, but i personally think that if you are doing a low powered system, you could us Particle Board..

I do believe that I'll go with round ports...not positive though. What are the pros/cons to each? Is there any real difference?

I'm playing around with the online version of ISD right now, thanks Kevin!

I swear, people only read 1/2 the posts don't they...12" Infinity Kappa DVQ. 92 Ford Ranger. I've got the box dimensions already laid out, I'm just deciding on a material, but I think I'll just stick with the 3/4. It won't be a low power system . Right now I'll be pushing it with my old Interfire 4700, should get around 300w RMS @ 2ohms, not positive though. Future amping will consist of a 500w RMS.

This install is really only temporary anyway, 6 months tops. I'm buying an MKIII Supra some time this summer...soon as I can find one in my area that I like! :) The Supra's getting 2 W7's with 1000/1's on each one in a fiberglass enclosure residing in the hatch and possibly the area where the back seats were once located.

Be sure to post some pics of that Supra!!! I would like to see that install. Do you really want 2 W7's in a hatchback??? You definitely will need some earplugs

*raises eyebrows* I know :)

I'm going for a daily driven stereo that will also be competition worthy. Should be one loud motha. JL Components in the front too driven by...bah I forgot what kind of increments JL's amps come in. I think it was like 300/2 or something to that effect. Alpine CDA-9827 is my headunit of choice...probably not the best thing in the world, but I love the looks and its user-friendliness!

BTW...noob question: WTF is Acoustic Power?

I'm not sure about acoustic power. I don't have the program here at work, so I can't look to see what it is. If I remember correctly it may be the power you plan on giving your speaker(s), but I'm not sure. When using that program make sure the T-S parameters are correct for your model of driver. Sometimes the preset drivers are for older models. You can find these in the speaker's manual or online pretty easily.

T-S?? Say wha? All I'm doing is the port calculator. There aren't any "T-S" parameters...

Sorry if I confused you :)
You only need the TS parameters if you use the box building part of the software. For port construction I have no idea what acoustic power would be.