If you use LVM with Wheezy on a solid-state drive, you really want to install the latest lvm2 update (i.e. 2.02.95-6, which contains the changes of -5). Otherwise, if you set issue_discards=1 in /etc/lvm/lvm.conf, you will experience severe data loss when using pvmove. Happened to me twice, once I didn't care (chroot data being lost), the second time (today) I did. Not fun, especially when the backup of the data was scheduled for the same day.
One has to wonder why it takes three months for a bug that trashes data to reach testing. (Obviously I know the answer, but they're not particularly good reasons.) Other distributions, like Ubuntu, were much quicker to notice and incorporate that fix. And in the case of the named distribution not because they auto-synced it from unstable. If somebody notices such a grave bug, please yell at people to get the fix out there to our users. Thanks.