I've been pointing people here:

• There's an issue with an Alpha/Beta Release of Ubuntu, what should I do?
• When are questions about "ubuntu+1" appropriate?

I think pointing people to those threads would be sufficient. Something like:

"Please note that 11.04 is alpha. See this question to see what's appropriate to ask, and check here to see how to get help." or something.

I've been pointing people here:

• There's an issue with an Alpha/Beta Release of Ubuntu, what should I do?
• When are questions about "ubuntu+1" appropriate?

I think pointing people to those threads would be sufficient. Something like:

"Please note that 11.04 is alpha. See this question to see what's appropriate to ask, and check here to see how to get help." or something.