Free CD/DVD burner applications like JetBee and BurnAware have been my choice as small and fast Nero alternatives, UsefulUtils Discs Studio is another utility boasting full-featured professional multi-format CD/DVD burning capabilities bundled into an application sizing just 297 KB with setup size of 586 KB.
The free utility supports SCSI, ATAPI, Parallel port, USB and FireWire devices with features like On-The-Fly burning, PerformOPC, Over-burning, Test burning, Buffer Underrun Protection, various burning modes, bootable discs, Multi-session disc burning with choice of session import, multiple disc copies and audio track ripping with conversion to WMA, MP3, OGG and FLAC with FreeDB support.