One is fine for a laptop, where I try to keep as few things connected at once as possible (less of a chance of dropping the laptop and destroying the thing plugged into it, like I did with my USB thumb drive). In that rare 1% of cases where I need more than one plug, USB hubs are cheap and easy to come by.
I'm especially interested in playing with one of the new USB-C plugs.
clip-on Bluetooth keyboards for phones or something?
Only keyboard cases I've seen are for iPhones (I'm not a fan of iOS) or the Samsung Galaxy SIII. I would have bought an N4 or N5 if there'd been a keyboard case for it. Same with any of the new Moto or HTC offerings.
I own a first gen Nexus 7. IMO, it's the ideal size for a personal video-watching device--not large enough to be cumbersome but with a big enough screen to make TV show watching thoroughly enjoyable. It's also ideal for reading articles and great at viewing "full web" (non-mobile) pages. The price (under $200) was the main selling point to me, and I really did feel like it was amazing bang for the buck (especially compared to my wife's similarly-priced Kindle Fire).
Lollipop rendered my N7 basically unusable (would randomly shut itself off--mine, luckily, wasn't one of those whose device got caught in the infinite reboot cycle), but Thank God there's Cyanogenmod, where my N7 is a big sluggish but still perfectly functional. The sluggishness would probably have been enough to make me consider buying a replacement, and I'm sad that there isn't one (I will never buy another Samsung mobile device, and I hate the Kindle Fire series).
Ah, well. I'm used to being part of an unpopular and unprofitable niche market--I'm still waiting for someone (anyone) to release a new full QWERTY keyboard phone.
Of course, guys being guys, most will be tempted to make a 150% scale model instead...
That's a big fist.