Ya know, I sat back and realized something.
I have 2 Laptops:
1) Powerbook G4 667mhz 512Mb Ram (Personal/School)
2) HP Intel Core 2 Duo 1GB Ram (Work, can use for personal also)
The HP is obviously faster, has a Combo Drive, more storage etc. etc.
The Powerbook is obviously slower, it's optical drive has been dead for a few months, has lots of dents, scratches (folks at school swear I use it to skateboard on).
Guess which one I use most..... The Powerbook.
I think it's because:
1) looks cooler, even all beat up

(It has...charictar lol)
2) It's thinner
3) It's relyable
4) It's sturdy
5) It does 90% of what I need when I'm on the go,
-Notes,
-Office Docs,
- iTunes,
- Quicktime, VLC, etc.
- Still watch my backed up dvd's [thanks to Handbrake]
(Yes they are my purchased DVD's)
- Chatting / I.M. with Adium & iChat
- Browse the Net and write oversized posts on my favorite forums
(like Macrumors

)
- Email, Caladering, etc...
- For times when I'm not on the go, for instance
video editing, 3D modeling etc. I use my desktop.
Anyhow, I bring this up to point out that normally I would have thought it crazy for people to mention that they would sacrifice having an optical drive to shrink their computer size. But then I realized I already do that.
Honestly, I don't know that I would buy a laptop without an optical drive, but I can certainly see where Apple could offer some super-portable options that could be great for other people. I think for my needs Apple could spend R&D dollars on something other than figuring our how to get the casing smaller; but then again Apple isn't just making products for me so their R&D money if it will help others to get what they want/need that's awesome to. As a final note, in research you usually have a goal of what you want 'to-do' and usually along the way you tend to learn things that apply elsewhere also (that's been my experience anyway). I guess I'm trying to say that regardless if what they are doing it should have some benefits for everyone, regardless if we realize it or not.
Time for bed, I hope I made some sense and it wasn't just rambling.