Like most alt coins, feathercoin is simply a currency with a different set of parameters than bitcoin. In this particular case, they use scrypt for block generation (which is more ASIC resistant) and the block reward is higher at 200 coins per block. I also believe feathercoin follows litecoin's reward target of one block per 2.5 minutes.
If you believe that the hordes of bitcoins early adopters have alongside the prevalence of ASICs in bitcoin mining are issues, then you may be inclined to adopt litecoin or feathercoin. That said, the market scope is considerably smaller and there really isn't any significant technology differences between Bitcoin and feathercoin thus it's unlikely feathercoin will achieve broad market penetration.
Feathercoin, like Litecoin and Bitcoin is a proof-of-work based cryptocurrency. These are all vulnerable to 51% atttack. The lower the hash/s the more vulnerable to a 51% attack. Caveat emptor. – Stephen Gornick – 2013-05-10T02:55:10.353
1@StephenGornick can you explain how the lower amount of hash rate make the algorithm more vulnerable? If I create a crypto and if the whole world is mining it and gets in total 10Mhashes/second, why is this more vulnerable that another crypto with 10Thashes/second? – Salvador Dali – 2013-05-17T13:39:51.607
Because a single attacker might be able to afford to acquire 10 Mhash/s which gives full control over what new blocks consists of. If the attacker intends to steal, then the attacker simply holds new blocks (doesn't broadcast) until coins are spent and value is received then release the blocks which double spends those funds. Much easier to do if total hashing capacity is 10 Mhash/s than 100 Mhash/s, for example. – Stephen Gornick – 2013-05-24T17:26:53.970