Is there another currency, e.g. litecoin, that is a better investment at the moment?
From what I understand, if the difficulty doubles then you will make half as many bitcoins, however if the value of a bitcoin also doubles then there will be no change in the amount of cash you are making but the bitcoins you already have will be worth more. For GPU mining to remain profitable the value of a bitcoin has rise with or faster than the difficulty. E.g. the last difficulty increase was about 30% however the value of a bitcoin increase much more than that and so my GPU actually makes more money.
As I have just said, as long as the value increases faster than the difficulty, which it will probably will since most miners will now hoard bitcoins till they are worth hundreds if not thousands of dollars (i can only dream my few bitcoins will be worth thousands of dollars) and with the introduction of ASICs a majority of the new coins will go to a smaller number of people meaning that there will be less bitcoin sellers as the people without ASICs will not be able to produce new bitcoins and so will hoard as selling will technically put them at a loss.
Bear in mind this guess is based on the assumption that BFL is not a scam and is just one of the many possibilities that can occur over the next few months.
Just to answer the question, yes litecoins are profitable to be mined, my electricity is free (rent includes utilities) and coin mining isnt my dayjob so as long as i get something extra at the end of the month its a go for me.
The one thing I would say about litecoin is that it is essentially a bitcoin V2, if what i said about bitcoins is true then we will have a load of computer nerds holding assets which are worth the world's GDP, how is that any different to what the governments do control currency? Due to the nature of litecoin it will be several times more expensive to produce ASICs for it and so it is less likely that we have a few individuals with the worlds litecoins.
Note: Sorry if i have missed something that would be considered basic, it may seem like I am spreaiong FUD but I do support bitcoin and litecoin however I am very concerned about where they will be going after the introduction of ASICs