This is why the argument of solid state vs. tape is significant to me. No medium alive today besides tape is meant to store data long term. I consider long term more than 10 years. Hard drives have a typical life span of 3-5 years. Some do last much longer but some die sooner. Recordable optical media like CD-R and DVD+/-R can go bad even quicker than a hard drive or can last longer. It's a crap shoot, even using top grade blanks. SD and CF cards have not been around long enough in the consumer market to prove their reliability for 10-15 years of storage. The article above states that SD cards will start to lose data after 10 years. Now they're developing cards that this, hopefully, won't happen to.
I know the argument of redundant backups very well and I'm not trying to argue against the convenience of solid state and hard drive recorders. I love my iRivers and D50 but I like to be able to put my project back to a tape and know that it will most likely be viable in 10 years without having to back it up in 3 different places numerous times over that 10 year period.
These are just my thoughts on the matter. I try to look at every side and hope others do the same.