Clojure also has a pretty cool way to not have to call (uniq) by hand. If, inside a backquote, you append a # to a symbol, clojure will replace that variable with a gensym. And it'll use the same gensym every time you use that variable in the backquoted form.
(defmacro and
"Evaluates exprs one at a time, from left to right. If a form
returns logical false (nil or false), and returns that value and
doesn't evaluate any of the other expressions, otherwise it returns
the value of the last expr. (and) returns true."
{:added "1.0"}
([] true)
([x] x)
([x & next]
`(let [and# ~x]
(if and# (and ~@next) and#))))
See how it uses and#, but it doesn't capture the variable and?
I'm not entirely sure how you would capture a variable (e.g., Arc's "aand"); if you try to, clojure errors by default. There's probably some way, but I don't know offhand.