Since there seem to be a new post every day for basic setup of ISU integration with CRM, here is one thread which provides links to the documents in the service marketplace and elsewhere.
Most of these documents are directly available at the Utilities page on the Service Marketplace https://service.sap.com/utilities
Choose 'SAP for Utilities - Product Information' then 'SAP CRM for Utilities' and lastly click on 'Cookbooks & Guidelines' as shown below
New 12-15-2013
CRM for Utilities Overview
https://service.sap.com/~sapidb/002007974700000213002013E/CRM_Utilities_2013.pdf
New 03-27-2013
WebClient UI Style Guidelines - great resource for understnading how to develop user interfaces in ICWC
http://www.sapdesignguild.org/resources/uiguidelines.asp
New 06-14-2012
Best Practices - Setting Up a Best Run Interaction Center with SAP for Utilities
https://service.sap.com/~sapdownload/011000358700000669512012E/SettingupaBestRunIC.pdf
New - 05-14-2013
The Utilities Check Cockpit
https://service.sap.com/~sapdownload/011000358700001040272011E
New - 11-14-2011
Link: [Defining Products and Packages|https://service.sap.com/~sapdownload/011000358700001236052011E/Pakete_Definition_e.pdf]
Link: [Selling products and packages|https://service.sap.com/~sapdownload/011000358700001235842011E/Pakete_Verkauf_e.pdf]
Link: [Products and Product Packages|https://service.sap.com/~sapdownload/011000358700001424402010E/Final-Produktpakete_EN.pdf]
Link: [Error handling with replication of contracts and TMD|https://service.sap.com/~sapdownload/011000358700004455162003E/Errorhandling_IS_U_CRM_e.pdf]
Link: [Using ISU Master Data Templates|https://service.sap.com/~sapdownload/011000358700000623432005E/Cookbook_MDT_e_140507.pdf]
Link: [ISU Setup Load Guide for Business Agreements/Contract Accounts|https://service.sap.com/~sapdownload/011000358700001088262009E/SDG_busagrmnt_contrtacc_e.pdf]
Link: [ISU Setup Load Guide for BP relationships|https://service.sap.com/~sapdownload/011000358700000347572009E/SLG_GP_rel_Partner_roles_e.pdf]
Link: [ISU specific Business Partner Load Setup|https://service.sap.com/~sapdownload/011000358700001064192007E/SLG_GP_ISU_V2.pdf]
Link: [ISU-CRM Contract Integration - Contract Management|https://service.sap.com/~sapdownload/011000358700001143442009E/ContrIntegr_021009_e.pdf]
Link: [ISU-CRM Marketing Integration|https://service.sap.com/~sapdownload/011000358700000503312010E/Cookbook_Marketing_2007_e2.pdf]
Link: [Master Agreements in Sales Processing for C&I|https://service.sap.com/~sapdownload/011000358700000159352009E/Rahmenvertraege_CRM2007_e.pdf]
Link: [Quotation Calculation in Sales Processing for C&I|https://service.sap.come/~sapdownload/011000358700000483592009E/Kalkulation_CRM70_Gesamt_e.pdf]
Link: [Replication of BP Contacts to CRM Activities, Interaction Records|https://service.sap.com/~sapdownload/011000358700000646422009E/Replication_BP_Contacts.pdf]
Link: [Replication of Technical Objects - Connection Object, Premise, Point of Delivery|https://service.sap.com/~sapdownload/011000358700001988852008E/TechnicalObjets_KW_261108.pdf]
Link: [Archiving ISU/CRM Objects|https://service.sap.com/~sapdownload/011000358700000732942010E/Utilities_CRM_Archiving.pdf]
Link: [Utilities Process Framework|https://service.sap.com/~sapdownload/011000358700001113322009E/Utilities_Prozess_FW_en.pdf]
Link: [Replication of ISU Price data|https://service.sap.com/~sapdownload/011000358700000042352009E/MDG_Preisreplikation_e.pdf]
Link: [Usage of ISU Consumption Profiles|https://service.sap.com/~sapdownload/011000358700000065322009E/Profile_e_final.pdf]
Link: [SAP Help - CRM with SAP for Utilities|http://help.sap.com/saphelp_crm700_ehp01/helpdata/en/46/66235fc77c453a8696f76c66e8014c/frameset.htm]
Link: [Performance of Initial Download from ERP into CRM for ISU|https://service.sap.com/~sapdownload/011000358700000101082010E/Perf_Initial_Download.pdf]