Current location: Warsaw. Vilnius was really great city. It's small, really interesting, and lots of fun. The weather was a bit ****, however. The entire old town is a UNESCO heritage site, so you can imagine how beautiful it is.
There are tons of cool bars and restaurants sprinkled throughout the old town. I stayed at an amazing hostel close to the town hall, Jimmy Jumps house. It's brand-new and pretty nice, but the other guests really made it worth while. 9 of us ended up going out Thursday and Friday nights.
I took a night coach to Warsaw. It wasn't as luxurious as my coach to Riga, but it was comfortable enough (I actually slept!). As I write this, it's 10 AM and I'm sitting in my hostel. I'll most likely go sight-seeing, then finish checking in here.
I highly, highly recommend the Baltic countries as a destination. Riga and Vilnius were both incredibly fun. I didn't stop in Tallinn on this trip, but I enjoyed it when visiting several years ago. Travel between the three cities is quite easy and comfortable. They are also compact and easily walked. I am absolutely heading back sometime in the future - each country has plenty more to see outside of the capitals.