Cool. Hadn’t come across the Lang-8 community of mutually-supportive language learners. Here are some random ideas for automating arbitrary data sources:
If they send you a convenient email every time that you’ve done something productive, you could use that and IFTTT or Zapier to add a datapoint to a Beeminder goal.
If that email happens to have a numeric points value in just the right place, you may be able to extract it using our IFTTT macros or some fancy Zapier parsing. If not, then there may still be value in just using the number of emails as a proxy for your progress.
If you’re not already using this RescueTime hack, you could set the Lang-8 website as its own special category (I think you’re only allowed to have one) and beemind the time spent on the site. If you wanted to count that as ‘days that I studied’ rather than the elapsed time, our premium plans let you set a custom ‘aggregation’ function that treats the day as binary.