In reply to John Burns:
Though the recent snow storm that hit the Annapurna region is not as 'freak' as some make out, by and large Oct-Dec weather on the AC is pretty good - that's why it's the high season. Traversing any steep slopes up to/down from a pass after heavy snow will be dangerous but the Thorung La is safer than many (it's quite steep on the western side though). Unfortunately many of those recent deaths were due to poor decisions, inexperience and lack of suitable equipment and information.
When a Nepal trekking guidebook refers to a 'guide' they can be referring to a person of of any one of many levels of experience, from ambitious porter to almost-IFMGA guide. Most trekking guides are former porters who can speak some english and organise the job.
The AC is certainly one trek you do not need a real guide for and you can do with just a porter. Doing it totally alone, carrying all your own stuff, is certainly possible as you need very little gear, but it's also needlessly hard (even a 10kg pack starts to weight at 5000m) and much more pleasant going unloaded. It's also good to provide a local person with work, as the cost is nothing to you but a lot to them.
I'd second what the others have said about other people on the trail. You'll almost certainly not be alone.
Note also that roads have now eaten into all but several days of the traditional AC trek. You only *have* to walk from around Chame to Muktinath, the rest can be done on jeeps, bikes etc if you want. If you want to walk more you can and, particularly on the western side south from Jomsom, the locals have made new tracks off the main road so you can still walk through the villages etc like the old days.
Btw, I personally do not consider cold and altitude to be Objective Dangers in the technical climbing sense as they are quite easy to prepare for and the ways to mitigate them are well known, so minimising them really comes down to the climber. Avalanches and rockfalls are harder to minimise, other than just not being there. So other than in pretty unusual conditions, I would certainly not consider the AC to have any real Objective Danger. The Annapurna Sanctuary / BC trek on the other hand DOES traverse a section that is seriously prone to avalanche in spring time and a number of trekkers have died here, even in recent years.
Post edited at 20:58