Likw an Afterstep "drawer"? Not really, but....
There's no tile app that pops out more tiles.
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You can pile stuff onto both the dock (permanent vertical tile bar, usually on right of screen) and dock (per-workspace settings, usually top left of screen).
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The clip can be set to "autoraise" or "autocollapse". Clicking or double-clicking on the clip will raise/expand it. You can also create "omnipresent" icons which appear on all workspaces (otherwise they just appear on the current workspace), and specify an icon be "kept" (otherwise it is deleted when the app is closed). I'd also recommend "autoattract icons". All of these settings are on a desktop-by-desktop basis.
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You've also got workspace menus. The apps menu can be torn off at an arbitrary nesting depth. If you drag it to the bottom of the screen, it will pop up when you mouse over it, which may be handy.
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There are also some launcher apps which handle multiple apps. I don't use them, but see the Windowmaker [link|http://www.bensinclair.com/dockapp/|DockApp Warehouse] for examples.
