Hello people! I'm new to bitcoin and i have some questions for you. First of all i want to ask if today (2013) bitcoin is dead or if its worth mining.
{sarcasm}Yes, it is dead. Nobody uses it, nobody buys it, nobody sells it, nobody wants it. The current exchange rate is $1 per 20,000,000 bitcoins. This forum doesn't exist and there is nobody here participating in conversations.{/sarcasm}
Seriously, isn't that a silly question?
I really like the whole idea with the currency and i want to continue mining. So, are you suggesting me to go and buy an ASIC USB miner (a bunch of them) and start mining?
Do you have a lot of money to buy equipment with? Are you just doing it for fun, or do you require a guaranteed profit?
Which wallet is the best? Online wallets like coinbase or a local wallet like Multibit?
Best for what?
Paper wallet is probably best for security from hacking.
blockchain.info is great for portability and convenience.
Bitcoin-Qt allows you to be a fully participating node on the network.
They are all best for their designed niche.
Unless they changed their business model, coinbase does not supply a wallet. Coinbase offers you an account with them, and they maintain all the bitcoins in their own wallets. I do not trust uninsured, unregulated, un-audited accounts.
Is it secure to keep the same wallet forever?
That depends on how well you protect it.