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"Dear $name"              # Perl and PHP
"Dear %s" % expr          # Python and Ruby % printf-like operator
...
"Dear "+`expr`            # Python backticks (TMTOWTDI)
"Dear #{expr}"            # Ruby string interpolation
"Dear @{[expr]}"          # Perl "Baby Cart" string interpolation

5 * "X"    also produces "XXXXX" in Python! TMTOWTDI! :)
5 * "X"    ... but not in Ruby (won't compile: type error)
5 x "X"    ... or Perl (produces empty string)

$"x(318%$_/9)        Perl
" "*(318%i/9)        Ruby
318%i/9*" "          Python

n=99
z=lambda:`n or 99`+" bottle"+"s of beer on the wall"[n==1:]
while n:y=z();n-=1;print"%s, %s.\n"*2%(y,y[:-12],n and"Take one down a
+nd pass it around"or"Go to the store and buy some more",z())

n and"Take one down and pass it around"or"Go to the store and buy some
+ more"

"Take"if n else"Go to"
(n>0)*"Take"or"Go to"
...
("Go to","Take")[n>0]
n and"Take"or"Go to"
"GToa kteo"[n>0::2]          # "Slice and Dice" wins this golf!