Weighing it at twice the size — 1.3GB vs 655MB — of the previous 10A394 build (itself the first major post-WWDC seed update), Snow Leopard 10A402 has been seeded to developers via Software Update from within the beta-stage Mac OS X 10.6. As usual, Apple’s seed notes were short on details….but reader & source reports have already begun to reach our inboxes and the early reviews are very positive.

Snow Leopard build 10A402 was released with typically minimal fanfare or detail in the seed notes which read only: “This Snow Leopard Developer Preview Update is recommended for all users running the Snow Leopard Developer Preview Build 10A394 or later. This update includes general operating system fixes for stability, compatibility, and security.”

However, within minutes of the update being posted to Snow Leopard’s Software Update, reports began to flow in rapidly from developers and others who are running these latest Mac OS X 10.6 test builds — now in early beta phase following last month’s World Wide Developer Conference where the landmark 10A380 build, essentially a feature freeze and beginning of debugging in earnest, was released. Read more