Pretty bold move. Still kinda standard when it comes to these lawsuits to ask the world and settle for less. I'm guessing Apple has some validity to some of its claims and it makes even more aggressive claims so as to make the other claims look more reasonable to the courts.
Usually when companies sue each other over patents they will throw about two to three times as many patents at the competitor than they expect to actually find them guilty of infringing.
Gruber linked to this
image recently. I found that rather amusing, though I am sure I could find Sci-Fi movie pictures and mockup devices that looked like the iPad. I think Apple was the first to get an actual functioning device in that form factor, though the JooJoo (which released after the iPad was announced, but before the iPad released) had a very similar design, albeit larger.
The design of the iPad and iPad-like tablets basically follows the design of the iPhone. Apple got design patents and community design registrations on that design and then followed up with versions of that design for the iPad. This was no secret, I think Jobs even bragged about it. I still think with my 20/20 hindsight that these companies could have gone after those design patents and community design registrations to get them invalidated as overly-general before hand. I am guessing they were trying to call Apple's bluff on actually enforcing IP protections. Apple has certainly proven they have no problem attempting to protect their IP, especially when it comes to the distinctiveness of their designs.
In the end, I think Apple's case is stronger with regards to some of the UI elements and the phone designs since the tablet designs are certainly obvious leaps from the iPhone design (though I don't know if that means the iPhone design patents would cover the tablets too). Indeed Verizon employees were even telling customers how much the Samsung Android phones were like the iPhone. That's not to say that Verizon sales people are the most knowledgable on the planet, but the fact that they had a phone for sale that was similar enough that they could use "its just like an iPhone" as a selling point is quite telling.
Either way this is all quite a mess. Personally, I think having alternatives is good for the customer, but I also think that these companies all play in the big leagues and they all know how IP protection works. From what I heard, Apple approached Samsung several times for over a year trying to use their leverage as Samsung's biggest customer to persuade Samsung to design their phones differently -- but Samsung refused. Samsung figured they would call Apple's bluff on the IP protection or risk losing Apple's business for components, but now it appears that Apple is carrying through on both.
In the end, part of Apple's suit is going to be thrown out and they may win part of their suit. Also, Samsung and others may get the tablet design patents and community design registrations invalidated. I think Apple does not want to ignore the problem like they did with Android phones riding on Apple's coattails. I think with tablets, Apple is determined to make it very hard to compete, just like Microsoft made it very hard for folks to compete against Windows. Apple should be careful though.... With the fledgling tablet market it is okay to have a dominant market share, but when the market is no longer "fledgling" the government is going to view that as a monopoly and it is going to stifle Apple's ability to innovate and protect their ecosystem.