Index: src/XMPPRoster.h
==================================================================
--- src/XMPPRoster.h
+++ src/XMPPRoster.h
@@ -33,6 +33,8 @@
 
 - initWithConnection: (XMPPConnection*)conn;
 - (OFArray*)groups;
 - (OFArray*)rosterItemsInGroup: (OFString*)group;
 - (void)addRosterItem: (XMPPRosterItem*)rosterItem;
+- (void)updateRosterItem: (XMPPRosterItem*)rosterItem;
+- (void)deleteRosterItem: (XMPPRosterItem*)rosterItem;
 @end

Index: src/XMPPRoster.m
==================================================================
--- src/XMPPRoster.m
+++ src/XMPPRoster.m
@@ -97,10 +97,15 @@
 	return [[[groups objectForKey: group] copy] autorelease];
 }
 
 - (void)addRosterItem: (XMPPRosterItem*)rosterItem
 {
+	[self updateRosterItem: rosterItem];
+}
+
+- (void)updateRosterItem: (XMPPRosterItem*)rosterItem
+{
 	XMPPIQ *iq = [XMPPIQ IQWithType: @"set"
 				     ID: [connection generateStanzaID]];
 	OFXMLElement *query = [OFXMLElement elementWithName: @"query"
 						  namespace: XMPP_NS_ROSTER];
 	OFXMLElement *item = [OFXMLElement elementWithName: @"item"
@@ -115,11 +120,31 @@
 	for (OFString *group in rosterItem.groups)
 		[item addChild: [OFXMLElement elementWithName: @"group"
 						    namespace: XMPP_NS_ROSTER
 						  stringValue: group]];
 
+	[query addChild: item];
+	[iq addChild: query];
+
+	[connection sendStanza: iq];
+}
+
+- (void)deleteRosterItem: (XMPPRosterItem*)rosterItem
+{
+	XMPPIQ *iq = [XMPPIQ IQWithType: @"set"
+				     ID: [connection generateStanzaID]];
+	OFXMLElement *query = [OFXMLElement elementWithName: @"query"
+						  namespace: XMPP_NS_ROSTER];
+	OFXMLElement *item = [OFXMLElement elementWithName: @"item"
+						 namespace: XMPP_NS_ROSTER];
+
+	[item addAttributeWithName: @"jid"
+		       stringValue: rosterItem.JID.bareJID];
+	[item addAttributeWithName: @"subscription"
+		       stringValue: @"remove"];
+
 	[query addChild: item];
 	[iq addChild: query];
 
 	[connection sendStanza: iq];
 }
 @end

Index: src/XMPPRosterItem.m
==================================================================
--- src/XMPPRosterItem.m
+++ src/XMPPRosterItem.m
@@ -27,13 +27,30 @@
 
 + rosterItem
 {
 	return [[[self alloc] init] autorelease];
 }
+
+- copy
+{
+	XMPPRosterItem *new = [[XMPPRosterItem alloc] init];
+
+	@try {
+		new->JID = [JID copy];
+		new->name = [name copy];
+		new->subscription = [subscription copy];
+		new->groups = [groups copy];
+	} @catch (id e) {
+		[new release];
+		@throw e;
+	}
+
+	return new;
+}
 
 - (OFString*)description
 {
 	return [OFString stringWithFormat: @"<XMPPRosterItem, JID=%@, name=%@, "
 					   @"subscription=%@, groups=%@>",
 					   JID, name, subscription, groups];
 }
 @end