I wish someone would build "Thunderbird" as a chrome application... Right now, there's not really a good multi-site email applciation... even if it were limited to IMAP, or on-server. Not sure what the limits on localStorage or indexedDB are for chrome apps. Would be happy if it stored the credentials online somehow allowing me to use it wherever.

That's what I'd like to see, though I get most of what I need with webmail a cross-platform, portable email app would be really nice, where I control the data, not stored on someone else's platform, or from a party that doesn't control the platform. Though I do think if dropbox made such an app that used my dropbox for storage space I'd consider it.

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For that matter hosted/paid web apps... You buy an account on the platform with X compute and Y storage for $Z/month, could be built as a shim over DigitalOcean or the like... that just loads whatever apps you pay for, and/or free apps on the platform... you login, use your apps and they stay there, for you to access at-will.