感謝

かんしゃ
Kansha
Thanks, expression of gratitude

更新感謝
こうしんかんしゃ
Koushin kansha
Thakns for updating (your blog, for example)

感謝状
かんしゃじょう
Kanshajou
Thank you letter

*On a separate note, want to share this very interesting page I stumbled across.