Just Google "bitcoin market". Bitcoins are quite liquid, although the market is pretty volatile.

Some of us who mine Bitcoins need to sell some either to recoup our investments in hardware to generate them (repaying debt), or to purchase more hardware (reinvesting the profits).

EDIT

As pointed out in this thread, that's not a bitcoin address. That's just a GPG key fingerprint. Nothing to do with bitcoin itself. Terribly sorry for the foobar.

The original post:

> It's a bitcoin address, used for both sending and receiving. If you want to trade with a person, you enter that address as receiver's address in a transaction.

Nb., each bitcoin user can freely generate several addresses to protect privacy; up to and including using one-off addresses (i.e., address for just one transaction).

It's my PGP key fingerprint. Copy the last two blocks and you've got my key ID - with that, my key is fetchable from public keyservers and has my email address on it.

Please have a look at HN Guidelines [0] -- spam ought to be flagged (the `flag' link next to the post) rather than downvoted.

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[0] http://ycombinator.com/newsguidelines.html

There is no centralization with Bitcoin.

Because Bitcoin transactions are not able to be reversed, buying them is notoriously difficult online, as fraudsters like to buy them with stolen credit cards. (Of course, this means that almost nobody sells Bitcoins for PayPal/credit cards/etc. due to chargeback risk.)

It's much better to deal with someone you know, or, failing that, someone with existing reputation. I was hoping to make life easier for fellow HN scenesters.

Please pardon the intrusion, commerce-phobe.