Circumstellar disks associated with PMS stars are the site where planetesimals form and grow,
and ultimately where planets are produced. A key phase in the evolution of such disks is the phase
where clearing of the disk has begun, potentially enabling direct detection of giant planets, but
the disk retains sufficient material that indirect signatures that these are young planetary systems
are also present. After reviewing what has been learned from studies of the IR spectral energy
distribution and (sub)mm-interferometry, I will discuss recent results obtained as part of the
Strategic Exploration of Exoplanets and Disks with Subaru (SEEDS).
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