It's truly remarkable to see almost every trace of a successful, well-established Valley start-up's work wiped out in the span of 24 hours, but here we are: T-Mobile's discontinuing the Sidekick line as of tomorrow, July 2, which effectively means that the Sidekick LX 2009 will no longer be available. As a refresher, the latest Sidekick LX was the last product holistically engineered by Danger as it got shoehorned into Microsoft -- square peg in a round hole, as it were -- before repurposing the team to work on the just-killed Kin line. In a way, it's a miracle that the LX ever went back on sale following the nightmarish data issues they'd gone through last year, so we suppose it's a silver lining that they made it this far -- but still, it's sad to see Danger's years of design effectively vaporized without a trace like this. For what it's worth, T-Mobile says that it's working "on the next chapter of [its] storied Sidekick franchise" and to "stay tuned" for a "fresh" experience, but since T-Mobile owns the Sidekick brand (not Danger / Microsoft), we've got every reason to believe these new products will be based on Android considering the carrier's huge investment in its myTouch line. Adios, Sidekick -- we'll do one last screen flip in your honor.