A couple of useful scripts for non dbas.

indexFragmentation.sql

--- this one may impact performance run at a quiet time
-- change  INSERT YOUR DB NAME HERE to your db name

SELECT object_name(IPS.object_id) AS [TableName], 
   SI.name AS [IndexName], 
   IPS.Index_type_desc, 
   IPS.avg_fragmentation_in_percent, 
   IPS.avg_fragment_size_in_pages, 
   IPS.avg_page_space_used_in_percent, 
   IPS.record_count, 
   IPS.ghost_record_count,
   IPS.fragment_count, 
   IPS.avg_fragment_size_in_pages
FROM sys.dm_db_index_physical_stats(db_id(N'INSERT YOUR DB NAME HERE'), NULL, NULL, NULL , 'DETAILED') IPS
   JOIN sys.tables ST WITH (nolock) ON IPS.object_id = ST.object_id
   JOIN sys.indexes SI WITH (nolock) ON IPS.object_id = SI.object_id AND IPS.index_id = SI.index_id
WHERE ST.is_ms_shipped = 0
ORDER BY 1,5

suggestedindexes.sql

--- none of this stuff is mine... just cobbled from the internets

SELECT
mid.statement
  ,migs.avg_total_user_cost * (migs.avg_user_impact / 100.0) * (migs.user_seeks + migs.user_scans) AS improvement_measure,OBJECT_NAME(mid.Object_id),
  'CREATE INDEX [missing_index_' + CONVERT (varchar, mig.index_group_handle) + '_' + CONVERT (varchar, mid.index_handle)
  + '_' + LEFT (PARSENAME(mid.statement, 1), 32) + ']'
  + ' ON ' + mid.statement
  + ' (' + ISNULL (mid.equality_columns,'')
    + CASE WHEN mid.equality_columns IS NOT NULL AND mid.inequality_columns IS NOT NULL THEN ',' ELSE '' END
    + ISNULL (mid.inequality_columns, '')
  + ')'
  + ISNULL (' INCLUDE (' + mid.included_columns + ')', '') AS create_index_statement,
  migs.*, mid.database_id, mid.[object_id]
FROM sys.dm_db_missing_index_groups mig
INNER JOIN sys.dm_db_missing_index_group_stats migs ON migs.group_handle = mig.index_group_handle
INNER JOIN sys.dm_db_missing_index_details mid ON mig.index_handle = mid.index_handle
WHERE migs.avg_total_user_cost * (migs.avg_user_impact / 100.0) * (migs.user_seeks + migs.user_scans) > 10
ORDER BY migs.avg_total_user_cost * migs.avg_user_impact * (migs.user_seeks + migs.user_scans) DESC

unusedindexes.sql

-- if the index is being updated and not used get rid.

SELECT    o.name AS object_name, i.name AS index_name
   , i.type_desc, u.user_seeks, u.user_scans, u.user_lookups
, u.user_updates, u.last_user_seek, u.last_user_scan
, 'Drop index ' + i.name + ' on ' + o.name as DropIndexStatement
FROM sys.indexes i
JOIN sys.objects o ON  i.object_id = o.object_id
LEFT JOIN  sys.dm_db_index_usage_stats u ON i.object_id = u.object_id
          AND    i.index_id = u.index_id
          AND    u.database_id = DB_ID()
WHERE    o.type <> 'S'    
and isnull(u.user_updates,0) > 0
and i.type_desc <> 'HEAP'
ORDER BY    (convert(decimal(19,4),ISNULL(u.user_seeks, 0)) 
+ ISNULL(u.user_scans, 0) 
+ ISNULL(u.user_lookups, 0))/ISNULL(u.user_updates, 0) asc
, user_updates desc, o.name, i.name