TASK DEFINITION: Generate the answer for a given question. The question requires common knowledge of English. Make sure that the answer is in detail, long, consistent with the context, and requires general knowledge of English. To be less repetitive, please vary your language for each question. Give a proper explanation to answer, and if necessary, provide the definition of various terms. And conclude your answer if it's long. If you have used other resources (e.g., Merriam Webster's.) to answer the question, include citations in your answer. You don't need to paraphrase the context of your resources, but make sure that your answer is consistent and complete.
PROBLEM: Possible Duplicate: Why don't we use the indefinite article with 'software'? In France I have always been told that saying 'a software' is not correct English (as a nominal compound), and that 'a piece of software' or 'a software program/package/product/system' must be used instead. Recently I have doubts... is there any case where it is actually correct? Examples found on the Internet: SalsaJ, a software for data analysis at school So if you sold a software which required your customer to pay a monthly fee, [...].

SOLUTION: No, this is always wrong. Both examples you provide contain incorrect usage of the term 'software.' (A mistake is still a mistake even if many people make it.) However, there might be special cases where you'd see the article preceding software. For example: A software solution would be better for the problem than a hardware one. The indefinite article 'a' modifies 'solution', not 'software', in this case in spite of preceding 'software' in this case.

PROBLEM: This is a question for English wordsmiths. Is there a word that 'feels' like the word 'ethereal' that means something ethereal that quickly disappears. Or is 'ethereal' the correct word choice for this? Ethereal was the first word that popped into my head for this. From the various definitions that I've looked at for ethereal, it says delicate, beautiful, heavenly, etc. but not necessarily quickly vanishing, except for the secondary definitions related to ether that suggests it evaporates. I'm just wondering if there is a better word than this. I'm using the term 'ethereal skill' to describe a certain type of pilot skill (instrument flying) that requires tremendous practice to achieve proficiency, and once proficiency is achieved it is a beautiful thing, but if you don't practice it regularly, that skill vanishes after a few weeks. USAGE: Instrument proficiency is an ethereal skill that once obtained must be maintained through constant and regular practice.

SOLUTION: You are probably looking for the word ephemeral. ephemeral: Lasting for a very short time.

PROBLEM: What does 'I'm game' mean and what is its correct usage?.

SOLUTION:
I'm game means that I am up for the challenge, but arguably more commonly, I agree... Q: Fancy going for a drink? A: Sure, I'm game... or Q: I was thinking of going shopping. Do you want to come? A: Yes, I'm game... As for correct usage, as with most idioms, use it as you will... there is no correct usage as such.