How many people actually need bitcoin on the go? seriously why?
And you can use logmein.com 5min setup and free.
I know that was in response to a question, but that deserves the
Triple-facepalm picture you were asking for.
The real problem is that bitcoin infrastructure is immature and, due to the underlying immaturity of the computer industry, may remain so for decades. In particular, the "default" bitcoin client is largely a proof-of-concept. In order to use it securely, you need to understand at a fundamental level how your computer works. You need to not only guard against hardware failure with verified, off-site backups. You also need to make sure that any attacker compromising your day-to-day wallet is not also able to compromise your offline wallet (that may have been transiently written to the disk during creation).
The most secure way of generating a savings wallet is to generate bitcoin keypairs offline, then printing the result, then wiping the disk (or RAM if disk was not written to), then sending the coins to the public address from an Internet-connected computer. Secure storage of paper is a known problem that people understand well. However the are a few caviats to keep in mind: (1) You need a good quality, trusted random number generator, (2) any copy of the private key is equally valid, (3) AFAIK the 'default' client can not import such keypairs for spending.
If you are the average user who has not taken extreme measures to secure their computer, using an online service as your day-to-day wallet may be a reasonable way to limit the damage if your day-to-day wallet gets comprised. One difficulty is that the value of bitcoin has increased dramaticly over the past two years. What was once "spending money" may suddenly represent a substantial sum of money. Until the "default" client, or a third-party client that becomes trusted supports multiple wallets in a secure way; doing this separation on your home computer will be difficult and error-prone.
I think infrastructure is going to be a diffcult issue. If Bitcoin adpotion increases exponentially, I would expect transaction volume to also increase exponentially. The Asian-Pacific region is expected to run out of IP addresses by the end of the year, but few (north american) ISPs have made the transition to IPv6. Asside from the addressing issue is the fact that the Terms of Service attached to most consumer Internet connections prohibit hosting servers; or using more bandwidth than some arbitrary limit. If we don't carefully plan ahead, the bitcoin network will become even more centralized. I also feel that bitcoin nodes should be using hardware and software from diverse suppliers. I think the bitcoin community may run more diverse hardware and software than most.