My solution for VimGolf Challenge "Braces or Brackets?" at http://vimgolf.com/challenges/4d1a522ea860b7447200010b

gistfile1.txt

# 50 Characters
Vjj:!tr '{}[()' '(){[]'
jj$r{j3lr(7wlr)jr}j0.ZZ

# 49 Characters
Vjj:!tr '{}[()' '(){[]'
jj$r{jf{r(f}r)jr}j0.ZZ

# 48 Characters
Vjj:!tr '{}[()' '(){[]'
jj$r{jf{r(f}r)jr}w.ZZ

# 45 Characters
:%!tr '{}[]' '(){}'
jf(r[f)r]jr{j2lr[jr}ZZ

# 44 Characters
:%!tr '{}[]' '(){}'
jf(r[f)r]jr{7wr[jr}ZZ

# 41 Characters
:%!tr '{}' '()'
$r{4wr[f)r]jr{2jr}w.ZZ

# 40 Characters
:%!tr '{}' '()'
$r{4wr[f)r]jr{Lr}b.ZZ