It seems that the Chrome Web Store version is not yet 0.2! I meant to do that previously, but it seems I forgot (I'll get it done now). It addresses the following concern:
Would this make my coins "hackable/stealable" by any 0 day chrome/firefox/browser exploits?
Any exploit that could compromise the sandbox could also likely compromise the whole machine.
In 0.2 you can use the Block Explorer to examine your wallet without actually having to run the BitCoin client. This means you can keep wallet.dat on an encrypted partition via TrueCrypt or w/e and you can still monitor your account balance (although to send coins you will still need to start the BitCoin client for obvious reasons). In 0.2 the Block Explorer method of viewing a wallet supersedes the old way of connecting to the BitCoin client since the latter requires that your private key be stored in memory all the time (which is a bad idea).
UPDATE: 0.2 is uploaded to the Chrome Web Store; I think it takes up to two hours to actually update in people's browsers however.