diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,7 @@
 #Change Log
+###0.8.2
+* Added a `saveScreenshot` command, for conenience, which writes the results of the `screenshot` command directly to a given file path.
+* Added new `WebDriver` instance for `ExceptT`.
 
 ###0.8.1
 * Previously internal convenience functions `noReturn` and `ignoreReturn` are now exported in Test.WebDriver.JSON
diff --git a/src/Test/WebDriver/Class.hs b/src/Test/WebDriver/Class.hs
--- a/src/Test/WebDriver/Class.hs
+++ b/src/Test/WebDriver/Class.hs
@@ -23,6 +23,7 @@
 import Control.Monad.Trans.List
 import Control.Monad.Trans.Reader
 import Control.Monad.Trans.Error
+import Control.Monad.Trans.Except
 --import Control.Monad.Cont
 import Control.Monad.Trans.Writer.Strict as SW
 import Control.Monad.Trans.Writer.Lazy as LW
@@ -72,6 +73,9 @@
   doCommand rm t a = lift (doCommand rm t a)
 
 instance (Error e, WebDriver wd) => WebDriver (ErrorT e wd) where
+  doCommand rm t a = lift (doCommand rm t a)
+
+instance WebDriver wd => WebDriver (ExceptT e wd) where
   doCommand rm t a = lift (doCommand rm t a)
 
 
diff --git a/src/Test/WebDriver/Commands.hs b/src/Test/WebDriver/Commands.hs
--- a/src/Test/WebDriver/Commands.hs
+++ b/src/Test/WebDriver/Commands.hs
@@ -9,7 +9,7 @@
          -- ** Web navigation
        , openPage, forward, back, refresh
          -- ** Page info
-       , getCurrentURL, getSource, getTitle, screenshot, screenshotBase64
+       , getCurrentURL, getSource, getTitle, saveScreenshot, screenshot, screenshotBase64
          -- * Timeouts
        , setImplicitWait, setScriptTimeout, setPageLoadTimeout
          -- * Web elements
@@ -87,7 +87,7 @@
 import qualified Data.Text as T
 import Data.Text (Text, append, toUpper, toLower)
 import Data.ByteString.Base64.Lazy as B64
-import Data.ByteString.Lazy as LBS (ByteString)
+import Data.ByteString.Lazy as LBS (ByteString, writeFile)
 import Network.URI hiding (path)  -- suppresses warnings
 import Codec.Archive.Zip
 import qualified Data.Text.Lazy.Encoding as TL
@@ -222,6 +222,10 @@
     timeout (FailedCommand Timeout _)       = return Nothing
     timeout (FailedCommand ScriptTimeout _) = return Nothing
     timeout err = throwIO err
+    
+-- |Save a screenshot to a particular location
+saveScreenshot :: WebDriver wd => FilePath -> wd ()
+saveScreenshot path = screenshot >>= liftBase . LBS.writeFile path
 
 -- |Grab a screenshot of the current page as a PNG image
 screenshot :: WebDriver wd => wd LBS.ByteString
diff --git a/src/Test/WebDriver/Session.hs b/src/Test/WebDriver/Session.hs
--- a/src/Test/WebDriver/Session.hs
+++ b/src/Test/WebDriver/Session.hs
@@ -33,6 +33,7 @@
 import Control.Monad.Trans.List
 import Control.Monad.Trans.Reader
 import Control.Monad.Trans.Error
+import Control.Monad.Trans.Except
 --import Control.Monad.Cont
 import Control.Monad.Trans.Writer.Strict as SW
 import Control.Monad.Trans.Writer.Lazy as LW
@@ -196,7 +197,11 @@
 instance (Error e, WDSessionState m) => WDSessionState (ErrorT e m) where
   getSession = lift getSession
   putSession = lift . putSession
-  
+
+instance WDSessionState m => WDSessionState (ExceptT r m) where
+  getSession = lift getSession
+  putSession = lift . putSession
+
 instance (Monoid w, WDSessionState m) => WDSessionState (SRWS.RWST r w s m) where
   getSession = lift getSession
   putSession = lift . putSession
diff --git a/webdriver.cabal b/webdriver.cabal
--- a/webdriver.cabal
+++ b/webdriver.cabal
@@ -1,5 +1,5 @@
 Name: webdriver
-Version: 0.8.1
+Version: 0.8.2
 Cabal-Version: >= 1.10
 License: BSD3
 License-File: LICENSE
@@ -44,14 +44,14 @@
   if flag(developer)
     cpp-options: -DCABAL_BUILD_DEVELOPER
   build-depends:   base == 4.*
-                 , aeson >= 0.6.2.0 && < 0.11
+                 , aeson >= 0.6.2.0 && < 0.12
                  , http-client >= 0.3 && < 0.5
                  , http-types >= 0.8 && < 0.10
                  , text >= 0.11.3 && < 1.3
                  , bytestring >= 0.9 && < 0.11
                  , attoparsec >= 0.10 && < 0.14
                  , base64-bytestring >= 1.0 && < 1.1
-                 , transformers >= 0.2 && < 0.5
+                 , transformers >= 0.4 && < 0.5
                  , monad-control >= 0.3 && < 1.1
                  , transformers-base >= 0.1 && < 1.0
                  , lifted-base >= 0.1 && < 0.3