With so many tablets now available, it seems incredible that a serious threat to the Apple iPad has not yet emerged.

The lack of a Goldilocks-esque just-right balance between portability and connectivity, sleek styling and dual processing, is much to blame. Like that of the MP3 music player before it, the tablet market is littered with models that, for one reason or another, have failed to capture the public's imagination. Yet, Amazon's unveiling of the eagerly awaited Kindle Fire this Wednesday may change the landscape of the tablet marketplace yet again. While most tablets have struggled to land a solid footing, five companies have managed to offer successful products by focusing on different areas.

Start the slideshow to take a look at the top 5 tablets currently leading the pack.

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Asus Eee Pad Transformer
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