Miguel del Valle brings his experience as a lifelong Chicagoan as well as his job experience into his candidacy for mayor. He has many years of experience in city government, but not in a position with the scope and intensity of the mayor's office.
So far he has been the only mayoral candidate to address many significant environmental issues, including sustainable transportation.
To get a sense of his ideas on specific issues, I recommend reading his answers to the Tribune Editorial Board's questionnaire and the IVI-IPO questionnaire.
Chicago Tonight has an election blog, which provides continually updated coverage of his campaign.
His official campaign web site adds more information.
All of these sources are worth reading to get a better sense of the candidate.