diff --git a/hsrc_lib/Database/LMDB/Raw.hsc b/hsrc_lib/Database/LMDB/Raw.hsc
--- a/hsrc_lib/Database/LMDB/Raw.hsc
+++ b/hsrc_lib/Database/LMDB/Raw.hsc
@@ -785,8 +785,8 @@
     if (0 == rc) then fromIntegral <$> _peekCInt pCount else
     _throwLMDBErrNum "mdb_reader_check" rc 
 
--- | Dump entries from reader lock table.
-mdb_reader_list :: MDB_env -> IO [String]
+-- | Dump entries from reader lock table (for human consumption)
+mdb_reader_list :: MDB_env -> IO String
 mdb_reader_list env =
     newIORef [] >>= \ rf ->
     let onMsg cs _ = 
@@ -796,7 +796,8 @@
     in
     withMsgFunc onMsg $ \ pMsgFunc ->
     _mdb_reader_list (_env_ptr env) pMsgFunc nullPtr >>= \ rc ->
-    if (0 == rc) then L.reverse <$> readIORef rf else
+    let toMsg = L.foldl (flip (++)) [] in
+    if (0 == rc) then toMsg <$> readIORef rf else
     _throwLMDBErrNum "mdb_reader_list" rc
 
 withMsgFunc :: MDB_msg_func -> (FunPtr MDB_msg_func -> IO a) -> IO a
@@ -913,7 +914,10 @@
 
 -- | Open a database that supports user-defined comparisons, but
 -- has slightly more FFI overhead for reads and writes.
-mdb_dbi_open :: MDB_txn -> String -> [MDB_DbFlag] -> IO MDB_dbi
+--
+-- LMDB supports a small set of named databases, plus one 'main'
+-- database using the null argument for the database name.
+mdb_dbi_open :: MDB_txn -> Maybe String -> [MDB_DbFlag] -> IO MDB_dbi
 mdb_dbi_open txn dbName flags = MDB_dbi <$> mdb_dbi_open_t txn dbName flags
 
 -- | database statistics
@@ -942,7 +946,7 @@
 mdb_clear :: MDB_txn -> MDB_dbi -> IO ()
 mdb_clear txn = mdb_clear_t txn . _dbi
 
-mdb_dbi_open' :: MDB_txn -> String -> [MDB_DbFlag] -> IO MDB_dbi'
+mdb_dbi_open' :: MDB_txn -> Maybe String -> [MDB_DbFlag] -> IO MDB_dbi'
 mdb_dbi_open' txn dbName flags = MDB_dbi' <$> mdb_dbi_open_t txn dbName flags
 
 mdb_stat' :: MDB_txn -> MDB_dbi' -> IO MDB_stat
@@ -961,9 +965,15 @@
 mdb_clear' txn = mdb_clear_t txn . _dbi'
 
 
-mdb_dbi_open_t :: MDB_txn -> String -> [MDB_DbFlag] -> IO MDB_dbi_t
-mdb_dbi_open_t txn dbName flags =
+mdb_dbi_open_t :: MDB_txn -> Maybe String -> [MDB_DbFlag] -> IO MDB_dbi_t
+mdb_dbi_open_t txn Nothing flags = -- use nullPtr for name
     let cdbFlags = compileDBFlags flags in
+    alloca $ \ pDBI ->
+    _mdb_dbi_open (_txn_ptr txn) nullPtr cdbFlags pDBI >>= \ rc ->
+    if (0 == rc) then peek pDBI else
+    _throwLMDBErrNum "mdb_dbi_open" rc
+mdb_dbi_open_t txn (Just dbName) flags = -- use string name
+    let cdbFlags = compileDBFlags flags in
     withCString dbName $ \ cdbName ->
     alloca $ \ pDBI ->
     _mdb_dbi_open (_txn_ptr txn) cdbName cdbFlags pDBI >>= \ rc ->
@@ -1126,14 +1136,12 @@
 
 mdb_del' :: MDB_txn -> MDB_dbi' -> MDB_val -> Maybe MDB_val -> IO Bool
 mdb_del' txn dbi key Nothing =
-    allocaBytes (sizeOf key) $ \ pKey ->
+    alloca $ \ pKey ->
     poke pKey key >>
     _mdb_del' (_txn_ptr txn) dbi pKey nullPtr >>= \ rc ->
     r_del rc
 mdb_del' txn dbi key (Just val) =
-    allocaBytes (2 * sizeOf key) $ \ pKey ->
-    let pVal = pKey `plusPtr` sizeOf key in
-    poke pKey key >> poke pVal val >>
+    withKVPtrs key val $ \ pKey pVal ->
     _mdb_del' (_txn_ptr txn) dbi pKey pVal >>= \rc ->
     r_del rc
 
diff --git a/lmdb.cabal b/lmdb.cabal
--- a/lmdb.cabal
+++ b/lmdb.cabal
@@ -1,15 +1,15 @@
 Name: lmdb
-Version: 0.1.1
+Version: 0.2.0
 Synopsis: Lightning MDB bindings 
 Category: Database
 Description:
   LMDB is a read-optimized Berkeley DB replacement developed by Sysmas
   for the OpenLDAP project. LMDB has impressive performance characteristics 
   and a friendly BSD-style license.
-  
+  .
   You will need to install the lmdb development files to install this
   library, e.g. `sudo apt-get install liblmdb-dev` works for Ubuntu 14.04
-  
+  .
   At the moment, only a raw, low-level interface to LMDB is supported.
   
 Author: David Barbour