This year I have had one 60 day tourist visa issued in Vientiane and have done one run to the Kanchanaburi/Myanmar border which gave me 30 days. Apparently, I can do two border runs per year. I want to visit friends in Vientiane and was wondering if I can do a border run to Laos or would I have to apply for a second toursit visa if I go there? Will they give me a stamp for 30 days given that I have had a 60 day tourist visa issued in Vientiane earlier this year?

You can get 2 visa exempt entries at land border crossings per calendar year. 

There is is no restriction on doing another one due you getting a tourist visa.

Did you extend your 30 day entry for 30 days at immigration.

Thanks, Joe. Yes, I've had an extension. Thanks for letting me know about that. When I applied for my tourist visa I crossed the border by land so I wasn't sure if that toursit visa counted, but as you've clarified, I've only used one visa exempt entry so far.

Cheers!