I'll be visiting Thailand several times this year (once already - free 14 day tourist visa).

There used to be some restrictions in place as to how many tourist visas you could have back to back, or in one year etc. What's the case now? There will be some weeks in-between visits, but I will be a tourist each time.

I know that tourist visas are free for a while yet, but is that changing sometime?

Cheers.

You appear to be talking about Visa exempt entries. They have always been free.

You get 30 days if arriving by air and 15 days if arriving by land. There are no limits but you may be asked questions after making a few back to back.

With regards to Tourist Visas they are free at the moment and I think will be all this year.

There are no limits but individual Consulates set their own limits.