the advantages and disadventages of iPad

Disadvantages of Apple iPad
Flash is not supported, so you won't be able to watch most online videos or play online games. I agree that Flash is not stable in Mac, Linux and it needs lots of resources, so HTML 5 should be used instead...
No USB support. You can't connect your a PC keyboard, USB flash drive, USB hard disk, USB headset, wireless USB modem.... Well you actually can a USB port, but you need an adapter...
No built-in card readers. Want to transfer your pictures of videos from your digital camera? You will need to buy a couple of adapters from Apple then...
No cameraWant to use your Instant Messenger with a web-cam... Not on Apple iPad.
iPhone OSAlthough you may enjoy multi-touch and applications for Apple iPhone, you can't use most programs, because they work in Windows, Mac OS or Linux.
No remote administration
No multi-tasking. iPhone OS on Apple iPad works the same way as on Apple iPhone
iPad allows to read ebooks.... but it doesn't use eInk screen, so the feature doesn't have much sense
No HDMI
No CD/DVD/Blu-Ray.... Not really a disadvantage. These devices only collect dust
Wi-Fi is not stable on many iPads (will probably be improved)
You need to hold iPad in your hands when watching videos (unless you can find a better way)



Advantages of Apple iPad
Pretty fast (unless you want to watch a FullHD video with it)
Long lasting battery (unless you want to play resource intensive games)
Multi-touch
Many applications from App Store
Music and videos from iTunes store.
Allows to read books (If you really think that colorful screen is better than using eInk book readers).