Printing Digital Landscapes

[photophorous]

What is the recommended dpi/ppi for printing digital photos of intricately detailed subject matter such as landscapes? People often leave subject matter considerations out of these discussions, but I think it is relevant. I'm expecting presentation quality prints that can be viewed at close distance. Does anyone have experience in this area? How low can you go before the loss of detail is perceptible? I know 300 is the recommended standard, but people often say they can print at 240 or sometimes less. How does this apply to landscapes?

Thanks for your help.

Paul

Edit: I just realized this may be in the wrong forum. I put it here because I'm trying to decide if the current crop of DSLRs is enough to make prints I'll be happy with, but feel free to move this to another forum if you think it's appropriate. Thanks.