iFixit has also posted a full disassembly of the new 17-inch Unibody MacBook Pro. In particular iFixit points out that due to the new case design requires a screwdriver to replace RAM or the hard drive, both of which are user replaceable parts; unlike the battery.
The battery which makes up 20% of the machines weight is removable and iFixit expects many companies to begin offering replacements in the near future.
An official battery replacement for the 17-inch MacBook Pro from Apple costs $179.