For the 11" MacBook Air without the SD slot a mini USB to MicroSD adapter would give you potentially 64GB more storage:
http://amzn.com/B002HGFKR8
A friend with an 11" MBA was going to get one of these to try out but I haven't heard reports on how it worked out.
http://amzn.com/B002HGFKR8

A friend with an 11" MBA was going to get one of these to try out but I haven't heard reports on how it worked out.
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