I was just wandering if a gravitino could be in the WIMP class, because they are both massive (admittedly WIMP's more so) and are both weakly interacting and predicted by R-parity. i.e Gravitinos are a sub class of WIMPs.
The gravitino is massive and does couple to the neutral weak sector, so in that sense it is a weakly interacting massive particle. (Note that the 'W' in WIMP refers to the electrically neutral weak sector, and not as a general adjective.) The further implied question I'm sure you're wondering about is whether it's a candidate for CDM. This is the case, depending on the model. If R-parity is conserved and the gravitino is the LSP then it is a CDM candidate.