Easiest and cheapest way is to share it over the network from your PC, but that means leaving your PC on so other computers can acess it.
You could try something like thishttp://www.amazon.com/s/ref=nb_sb_noss/192-5607767-2792559?url=search-alias%3Daps&field-keywords=TP-...
But I can't say how well it works.
If you are thinking about upgrading your router you could get one that supports USB like Netgear ReadyShare.
If you can find a Goflex Home base unit then your drive will fit into it and you have a NAS, but the base units generally aren't sold separately.
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For the sake of your own health and sanity, if your data is important to you, keep a second copy on another storage (a backup)
