D&D Test Drive
Wizards is offering a very generous test drive of the new 4E rules to old and new or interested players alike.
H1 Keep on the Shadowfell and the Quick Start Rules booklet that comes with the pre-gen characters are now freely and legally available on the Wizards' website as separate PDF downloads.
They've also included a download link to the free version of the Character Builder so that you can create your own character up to level 3, which should include the options from Player's Handbook 2.
Even if you already own the module, it is still probably worth it to download this version of the adventure. There are some minor additions, changes to some of the encounters and even new monster stats that are in this PDF.
So what are you waiting for? It's free and it's legal! So now you don't have a good reason to not try out 4E at least once!