[notduncansmith]

I've found 4GB to be more than enough. I don't use a ton of memory-hungry software at once, though. Chrome with a few tabs, one or two terminal tabs (iTerm 2 sliced up into ~3 sections), a few Node processes, Skype, and Spotify is what my daily userspace software usage looks like. I fire up Photoshop every now and again, and my laptop doesn't miss a beat, even with all of the above running. I literally never find myself wishing I had more RAM.

[NoahBuscher]

Wow! Great to hear! I just wanted to be sure I had a buffer in the event I ever needed to edit a longer video or wanted to do some 3D work in Blender.

[xuki]

Given that the MBA RAM is not upgradable, it'd be wise to max it out - just in case.