I've started advising users of email and web surfing to resign their PCs entirely. Go, get an iPad or Android tablet ... or a Microsoft's Surface RT while it's still on sale. They're all great!
Even if you need Word & Excel, the Surface RT comes with slimmed-down versions of the Office favorites. I do recommend either of the cover/keyboards. The built-in kickstand is as clever as the removable keyboard.
If you're running legacy or Windows specific programs, then by all means stick with laptops and even desktops. I would not bother to compose these blog posts on anything but a full-sized keyboard and a mouse.
Now, there is an app for the iPad called Parallels Access that stretches the concept of the iPad as THE mobile device, as an addition to your Macs and PCs. Here's a hands' on video to whet your appetite (click the Parallels icon):
|From Engadget: http://www.engadget.com/2013/08/27/parallels-access/|
Again, not a replacement but an addition. Maybe a replacement for the laptop, though! Citrix - are you watching?!