Why the change? To ensure greater reliability; Bloglet hasn't been working for the last few weeks and it's on its way out. I'll let the creator of Bloglet explain more:
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Bloglet began as a hobby of mine to help manage the random blogs I'd read on a
daily basis. This was back when words like "blog" and "rss" had yet to enter most
people's vocabulary. Now "blogs" are being mentioned on the Daily Show, but
Bloglet still remains a hobby. It's obvious that I don't have the time to turn
this hobby into something that offers a fair level of service to users. On the
other hand, Phil and the team over at Feedblitz has been doing a great
job building their blog-to-email product into a viable service. They've even
built a Bloglet-to-Feedblitz converter. I recommend that any current users of Bloglet give them a try. In the meantime, I will leave Bloglet up and working as is, without any support. I'd like to phase it out slowly over the next few weeks.