We have released a major upgrade of the LongTrace software that offers improved basecalling and better looking traces for the ABI 3730, 3100, 3130 DNA sequencers. This release is a major rewrite of the LongTrace code and is significantly faster in trace processing. Removed from this version is the beta support for the ABI 3700 sequencer. For those users with 3700 sequencers we recommend using our PeakTrace basecaller instead as it provides much better support for a wider range of 3700 run conditions.