I just picked up one of the current iMacs, including the wireless options, and man am I impressed!
The best thing about this machine is I can get away from the computer with it. I can lounge on my couch and type as thoughts come to me while reading, instead of having to choose whether I'll be researching comfortably or sitting typing for a long stretch of time. A laptop doesn't permit this -- still too big and clunky -- but the Apple wireless keyboard can be stowed easily alongside your body while you read or watch TV -- I mean here, between your body and the couch back (with you reclining on the arm), and not taking up a seat beside you. Since it weighs a couple of ounces rather than 10 pounds, you don't need to shift positions to pick it up and make a note.
"OK," you ask, "but that certainly doesn't solve what to do when you have to reach the mouse and need a flat surface, does it?" Well, let me tell you, I can literally mouse with no difficulties at all using my leg as the "mouse pad"! The remote mouse is the best I've ever used.
The Apple remote controller is a wonder in simplicity. The whole thing works to control iTunes, DVDs, iPhoto, and more, with only six buttons! (Think of the number on your average TV remote.) What Apple seemed to realize is that a lot could be gleaned from context, e.g., you don't need 4 buttons to move up and down through a menu and raise and lower the volume -- when you're in a menu, you're not listening to anything, and when you're watching your movie, you're not scrolling through a menu! A pair of up/down buttons suffice four all 4 tasks.
The last thing I'll mention is the wonder of iMac setup. When I brought the computer up, I was asked, right away, if there was another computer I wanted to get settings and/or files from? Or, perhaps, a backup disk? I had my external Time Machine hardrive sitting on the same desk, I clicked yes. I went through a couple of screens deciding what to fetch from the old Mac, clicked "Go," and in one hour, my new computer looked exactly like my old one -- every user account, all my preferences, my bookmarks, my contacts, my photos, my songs, my network settings, my papers, etc. You may say, "One hour to set up!" But no, it was about two minutes to set up, and then I walked away for an hour while over 100 GB of data transferred over a USB cable. I have never, ever, since my first PC (where I had no data, programs, etc. and could just start figuring out what the hell it was right away), been up and working on a computer so quickly and painlessly.