Many Web Developers Moot on iPad Launch
With an installed userbase of only 300,000, the release of the iPad won't even be visible to most web users. While it may be prudent to be ready for the inevitable, many developers found few reasons to rush their sites. In fact, the only real reasons for being "iPad-ready" are bragging rights, a spot on Apple's "iPad ready" website list, and advertising money--and most sites were unlikely to make the cut for those ad dollars, if they weren't already working with advertisers pre-launch.
Other developers have their own reasons for not making their sites iPad-friendly, but those reasons are not very iPad-friendly to begin with.