JSLintMate - JSLint and JSHint in TextMate.
rondevera.github.com
rondevera.github.com
JSLintMate looks much nicer
Then, to install a package, you hit: 1) ctrl+shift+p 2) type "install" and select the package installation option 3) search for "SublimeLinter" and hit enter to intstall it
You're done! I've even discovered many new packages right through Package Control, such as Clipboard History.