Just picked up a micro SD adapter that sits flush in the MBA; allowing me to add another 64GB for about $55 ($40 card, $15 adapter). Not as fast as the internal storage, but perfectly fine for a music library or photos.
No, the 13" Air has an SD card reader, one which leaves part of the card sticking out and requires a special microSD adapter to sit flush, like the one already linked on this thread: http://theniftyminidrive.com
Lots of people with 13" Airs don't realise the 11" lacks the SD card reader, so it's a common mistake to make. (It's also a pity the 11" doesn't have it - I've missed the SD card reader a lot more than the ethernet port.)
Woe to those of us who are fans of the iMac for home usage. We have ONE SSD option in the new iMac, a whopping 1300 dollar upgrade to a 768g SSD. The previous system offered a 256g option which for many was sufficient.
How it benefits Apple to offer only a 768 (and why that number) I will never know. I can only imagine the sales they lose for not having the 256 or 512 options in the iMac. Its not like they don't have the parts