So, where does LotFP: Weird Fantasy fall on out list of D&D clones? At it's core, it is a B/X clone, but that falls quickly to the wayside as you read the classes.
It is a race as class type of system, but each class is purposefully given it's own niche. For example:
Only fighters can increase in combat ability. No other class get's more than a +1 to their to hitroll.
Dwarves are the HP powerhouse. They get 1d10 per level for HD and they can carry more than other classes. They also get a + 1 to their Constitution modifier for HP.
Elves can cast spells and get a 1d6 for HD (as opposed to the magic-users 1d4). I don't recall if they can use armor or not, but "Player Character Elves are those gifted individuals that are trained as both Fighters and Magic-Users."
Halfling get by far the best saves in the game, but that's about it.
Clerics are pretty close to the norm. They DO get a spell at first level.
Magic-users are what it says on the tin. You'll need to read the spell descriptions carefully, as there are enough that have been changed from the source material to keep you guessing.
Specialists (Thieves). This is where Weird Fantasy shines. The D6 mechanic that is substituted for the % rolls for thief skills is something I'm tempted to port over no matter which Old School ruleset I'm running with. Worth the price of admission on it's own, and when the price is free, it's hard to pass up.
Weird Fantasy does not have a monster book or section. DMs are expected to make each one unique. Or, just borrow from a different OSR game. Trust me, it will work.
Weird Fantasy is basically a B/X clone with some very unique house rules. It will feel familiar and yet not for those coming from the originals or their more direct clones, but the art free Weird Fantasy PDF is certainly something that every OSR gamer should have on their virtual bookshelf. As for the full version of the PDF or Print - just be aware, the artwork, while very good, may not fit into everyone's social norms for sex and gratuitous violence.
If you can find the older Grindhouse Edition, the Referee Book is priceless with the advice it gives.
LotFP Weird Fantasy (Free No Art PDF, PDF with Art $5, Print 21.18 Euros)