In reply to climbwhenready:
"The daisy chain can still take a "shock" load of 23 kN just as easily as it can take a "static" load of 23 kN"
This isn't quite right...
Under shock loading conditions (ie rapid application of force) significant temperature rises can be generated especially if knots are involved. This is one of the reasons why dynema is less good than nylon for shock loading (because it has a lower melting point) and partially why it is good to be a little cautious when tying knots in slings .
However, for the very short drops the standard test of a rigid 80Kg mass is not particularly relevant to the reality of a climber fall - the reason being is that a climber is not a rigid mass and the time scale of the "shock" is extended as the body deforms which lowers the peak forces. Another way to think of this is the centre of mass of the rigid weight stops very quickly and in a very short distance but the centre of mass climber stops more slowly and over an extended distance that is significant compared with the length of the fall.
Back to the OP's question - a sling is ok to connect to an anchor at a belay but try not to shock load it. I would tie a knot in a sling to shorten it and avoid shock loading without worrying too much.
Try to avoid using a sown daisy chain loop as a belay anchor because the yield strength of the loop stitching is much lower than the yield strength of the sling (2.5KN I think?) and it is possible that when holding belayer and fallen climber it may yield. In this case it will lengthen out to the full sling possible lowering belayer and climber a lot and possibly shock loading the anchors.
A daisy chain made of individual slings like this:
http://www.grivel.com/products/rock/accessories/56-daisy_chain
avoids the problem and just counts as a "sling".