Apple has released its iPhone SDK for iPhone OS 2.2.1. Weighing in at 1.75 GB and listed as build 9M2621a, the new SDK requires Mac OS X 10.5.5, and includes new, optional GCC and LLVM compilers, an updated project assistant, a simplified toolbar, and additional security enhancements. The iPhone SDK for iPhone OS 2.2.1 is available now to registered iPhone developers via Apple’s iPhone Dev Center.
